Files
bitcoin/src/util
Wladimir J. van der Laan 8ffaf5c2f5 Merge #19935: Move SaltedHashers to separate file and add some new ones
281fd1a4a0 Replace KeyIDHasher with SaltedSipHasher (Andrew Chow)
210b693db6 Add generic SaltedSipHasher (Andrew Chow)
95e61c1cf2 Move Hashers to util/hasher.{cpp/h} (Andrew Chow)

Pull request description:

  There are existing `SaltedOutPointHasher` and `SaltedTxidHasher` classes used for `std::unordered_map` and `std::unordered_set` that could be useful in other places in the codebase. So we these to their own `saltedhash.{cpp/h}` file. An existing `KeyIDHasher` is moved there too. Additionally, `ScriptIDHasher`, `SaltedPubkeyHasher`, and `SaltedScriptHasher` are added so that they can be used in future work.

  `KeyIDHasher` and `ScriptIDHasher` are not salted so that equality comparisons of maps and sets keyed by `CKeyID` and `CScriptID` will actually work.

  Split from #19602 (and a few other PRs/branches I have).

ACKs for top commit:
  laanwj:
    Code review ACK 281fd1a4a0
  jonatack:
    ACK 281fd1a4a0, code review, debug build and ran bitcoind after rebasing to master @ dff0f6f753
  fjahr:
    utACK 281fd1a4a0

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