Merge #17917: tests: Add amount compression/decompression fuzzing to existing fuzzing harness

7e9c7113afbed96cef80c327cc93e82000d6bb69 compressor: Make the domain of CompressAmount(...) explicit (practicalswift)
4a7fd7a7124f84e010b01d0769ef0572bf031ee8 tests: Add amount compression/decompression fuzzing to existing fuzzing harness: test compression round-trip (practicalswift)

Pull request description:

  Small fuzzing improvement:

  Add amount compression/decompression fuzzing to existing fuzzing harness: test compression round-trip (`DecompressAmount(CompressAmount(…))`).

  Make the domain of `CompressAmount(…)` explicit.

  Amount compression primer:

  ```
      Compact serialization for amounts

      Special serializer/deserializer for amount values. It is optimized for
      values which have few non-zero digits in decimal representation. Most
      amounts currently in the txout set take only 1 or 2 bytes to
      represent.
  ```

  **How to test this PR**

  ```
  $ make distclean
  $ ./autogen.sh
  $ CC=clang CXX=clang++ ./configure --enable-fuzz \
        --with-sanitizers=address,fuzzer,undefined
  $ make
  $ src/test/fuzz/integer
  …
  ```

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Tree-SHA512: 0f7c05b97012ccd5cd05a96c209e6b4d7d2fa73138bac9615cf531baa3f614f9003e29a198015bcc083af9f5bdc752bb52615b82c5df3c519b1a064bd4fc6664

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