Merge #17018: tests: Add descriptor Parse(...) fuzzing harness

b5ffa9f3dbff7dd008d4d00a88590d411ef991f2 tests: Add Parse(...) (descriptor) fuzzing harness (practicalswift)
fdef8bbf2f824a87f70b755155e9e1a8cd19fdcb tests: Allow for using non-default fuzzing initialization (practicalswift)

Pull request description:

  Add `Parse(...)` (descriptor) fuzzing harness.

  To test this PR:

  We can run `test_fuzzing_harnesses.sh` (#17000) during ten seconds to quickly verify that the newly added  fuzz harness seem to hit relevant code regions, that the fuzzing throughput seems reasonable, etc.

  `test_fuzzing_harnesses.sh descriptor 10` runs all fuzzers matching the regexp `descriptor` giving them ten seconds of runtime each.

  ```
  $ CC=clang CXX=clang++ ./configure --enable-fuzz --with-sanitizers=address,fuzzer,undefined
  $ make
  $ contrib/devtools/test_fuzzing_harnesses.sh descriptor 10
  Testing fuzzer descriptor_parse during 10 second(s)
  A subset of reached functions:
          NEW_FUNC[0/17]: 0x55ec8a240c90 in tinyformat::detail::formatImpl(std::ostream&, char const*, tinyformat::detail::FormatArg const*, int) src/./tinyformat.h:791
          NEW_FUNC[4/17]: 0x55ec8a2435f0 in tinyformat::detail::printFormatStringLiteral(std::ostream&, char const*) src/./tinyformat.h:564
          NEW_FUNC[5/17]: 0x55ec8a2439d0 in tinyformat::detail::streamStateFromFormat(std::ostream&, bool&, int&, char const*, tinyformat::detail::FormatArg const*, int&, int) src/./tinyformat.h:601
          NEW_FUNC[6/17]: 0x55ec8a24a3d0 in tinyformat::detail::FormatArg::format(std::ostream&, char const*, char const*, int) const src/./tinyformat.h:513
          NEW_FUNC[12/17]: 0x55ec8a29cd70 in void tinyformat::detail::FormatArg::formatImpl<long>(std::ostream&, char const*, char const*, int, void const*) src/./tinyformat.h:530
          NEW_FUNC[13/17]: 0x55ec8a29cf50 in void tinyformat::formatValue<long>(std::ostream&, char const*, char const*, int, long const&) src/./tinyformat.h:317
          NEW_FUNC[14/17]: 0x55ec8a2ea450 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > tinyformat::format<long>(char const*, long const&) src/./tinyformat.h:976
          NEW_FUNC[15/17]: 0x55ec8a346ac0 in void tinyformat::format<long>(std::ostream&, char const*, long const&) src/./tinyformat.h:968
          NEW_FUNC[16/17]: 0x55ec8a346d80 in tinyformat::detail::FormatListN<1>::FormatListN<long>(long const&) src/./tinyformat.h:885
          NEW_FUNC[0/16]: 0x55ec8a210c90 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > tinyformat::format<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/./tinyformat.h:976
          NEW_FUNC[2/16]: 0x55ec8a25c3e0 in void tinyformat::format<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::ostream&, char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/./tinyformat.h:968
          NEW_FUNC[3/16]: 0x55ec8a25c6a0 in tinyformat::detail::FormatListN<1>::FormatListN<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/./tinyformat.h:885
          NEW_FUNC[4/16]: 0x55ec8a25c980 in void tinyformat::detail::FormatArg::formatImpl<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::ostream&, char const*, char const*, int, void const*) src/./tinyformat.h:530
          NEW_FUNC[6/16]: 0x55ec8b29cc60 in (anonymous namespace)::ParseScript(Span<char const>&, (anonymous namespace)::ParseScriptContext, FlatSigningProvider&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) src/script/descriptor.cpp:810
          NEW_FUNC[8/16]: 0x55ec8b2a4710 in (anonymous namespace)::Expr(Span<char const>&) src/script/descriptor.cpp:657
          NEW_FUNC[9/16]: 0x55ec8b2a4d40 in (anonymous namespace)::Func(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Span<char const>&) src/script/descriptor.cpp:647
          NEW_FUNC[15/16]: 0x55ec8b2d7dd0 in Span<char const>::subspan(long) const src/./span.h:33
          NEW_FUNC[0/1]: 0x55ec8b2d7830 in Span<char const>::operator[](long) const src/./span.h:31
          NEW_FUNC[0/10]: 0x55ec8a2ea090 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > tinyformat::format<char const*>(char const*, char const* const&) src/./tinyformat.h:976
          NEW_FUNC[1/10]: 0x55ec8a345d40 in void tinyformat::format<char const*>(std::ostream&, char const*, char const* const&) src/./tinyformat.h:968
          NEW_FUNC[2/10]: 0x55ec8a346000 in tinyformat::detail::FormatListN<1>::FormatListN<char const*>(char const* const&) src/./tinyformat.h:885
          NEW_FUNC[3/10]: 0x55ec8a3462e0 in void tinyformat::detail::FormatArg::formatImpl<char const*>(std::ostream&, char const*, char const*, int, void const*) src/./tinyformat.h:530
          NEW_FUNC[4/10]: 0x55ec8a3464b0 in void tinyformat::formatValue<char const*>(std::ostream&, char const*, char const*, int, char const* const&) src/./tinyformat.h:317
          NEW_FUNC[8/10]: 0x55ec8b438ef0 in ParsePrechecks(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/util/strencodings.cpp:267
          NEW_FUNC[9/10]: 0x55ec8b4398b0 in ParseUInt32(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned int*) src/util/strencodings.cpp:309
          NEW_FUNC[0/3]: 0x55ec8a2e9430 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > tinyformat::format<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/./tinyformat.h:976
          NEW_FUNC[1/3]: 0x55ec8a33a6f0 in void tinyformat::format<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::ostream&, char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/./tinyformat.h:968
          NEW_FUNC[2/3]: 0x55ec8a33aa40 in tinyformat::detail::FormatListN<2>::FormatListN<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/./tinyformat.h:885
          NEW_FUNC[1/2]: 0x55ec8b4331b0 in IsHex(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/util/strencodings.cpp:61
          NEW_FUNC[13/24]: 0x55ec8b126eb0 in Params() src/chainparams.cpp:384
          NEW_FUNC[14/24]: 0x55ec8b19a500 in DecodeDestination(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/key_io.cpp:217
          NEW_FUNC[15/24]: 0x55ec8b19a610 in (anonymous namespace)::DecodeDestination(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CChainParams const&) src/key_io.cpp:74
          NEW_FUNC[18/24]: 0x55ec8b357160 in IsValidDestination(boost::variant<CNoDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessUnknown> const&) src/script/standard.cpp:325
          NEW_FUNC[19/24]: 0x55ec8b36fe40 in DecodeBase58(char const*, std::vector<unsigned char, std::allocator<unsigned char> >&) src/base58.cpp:36
  stat::number_of_executed_units: 54900
  stat::average_exec_per_sec:     4990
  stat::new_units_added:          421
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              412
  Number of unique code paths taken during fuzzing round: 93

  Tested fuzz harnesses seem to work as expected.
  ```

Top commit has no ACKs.

Tree-SHA512: f18d0a6798c55d2c85ef9e604af2c1d626da2b81c01ea3f77c5cecd4ce35b197030778b3cfebab4869dab84a022325dba94fd83290026bfbc59814938e1daa02

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