Merge #18021: Serialization improvements step 4 (undo.h)

3c94b0039d2ca2a8c41fd6127ff5019a2afc304e Convert undo.h to new serialization framework (Pieter Wuille)
3cd8ab9d11e4c0ea47e56be4f6f2fdd48806796c Make std::vector and prevector reuse the VectorFormatter logic (Pieter Wuille)
abf86243568af380c1384ac4e0bfcdcfd4dab085 Add custom vector-element formatter (Pieter Wuille)
37d800bea016d5cba5635db036f53a486614ed30 Add a constant for the maximum vector allocation (5 Mbyte) (Pieter Wuille)

Pull request description:

  The next step of changes from #10785.

  This one adds:
  * A meta-formatter for vectors, which serializes the vector elements using another formatter
  * Switch the undo.h code to the new framework, using the above (where undo entries are serialized as a vector, each of which uses a modified serializer for the UTXOs).

ACKs for top commit:
  laanwj:
    code review ACK 3c94b0039d2ca2a8c41fd6127ff5019a2afc304e
  jonatack:
    Qualified ACK 3c94b0039d2c
  ryanofsky:
    Code review ACK 3c94b0039d2ca2a8c41fd6127ff5019a2afc304e. Changes since last review: renaming formatter classes, adding suggested static_assert, and removing temporary in VectorFormatter

Tree-SHA512: 44eebf51a303f6adbbc1ca2b9d043e8ae7fd37e06778e026590892f8d09f8253067862a68ba8ca5d733fd2f8e7c84edd255370f5a4b6560259427a65f94632df

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