feat(spv): reverse quorum hash lookup function

[pauldelucia]

DAPI returns quorum hash in big endian in its ResponseMetadata that comes with query and state transition proofs, and in SPV we store quorum hashes in little endian. So if we want a client like DET to simply take the hash from DAPI and pass it to SPV, we need to reverse it before lookup.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/reverse-hash

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[xdustinface]

This seems more like a client specific thing. Shouldn't this be done in DET rather since SPV follows and matches core?