Process and verify merkle proofs (and multiproof) with custom hash function

[Amxx]

Fixes #4886

The hasher should be view, but the existing versions are pure. This is resulved by

• Keeping the existing versions (pure)
• Add new (view) versions that use the a custom hasher
• Both for memory and calldata
• Both for simple proofs and multiproofs

This large amount of code duplication is handled through procedural generation

---

• Tests
• Documentation
• Changeset entry (run npx changeset add)

[changeset-bot]

🦋 Changeset detected

Latest commit: b7d56bb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
openzeppelin-solidity	Minor

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[ernestognw]

I pushed some nits but the PR looks good imo. It may just need to be tested with custom hashing functions but that can't be done until we release the merkle tree library.

I'd be fine leaving an issue and merging, wdyt @Amxx? I see codecov was flagging a drop in coverage. Investigating both #4977 and this drop

[ernestognw]

LGTM, I left a TODO for when we release the Typescript library

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@openzeppelin/merkle-tree@1.0.7	Transitive: network	+28	2.39 MB

🚮 Removed packages: npm/@openzeppelin/merkle-tree@1.0.6

View full report↗︎

[ernestognw]

Thanks for updating the tests with the new Merkle Tree release.
LGTM