feat: impl hex_to_hash_rev and update unit tests

[lomasson]

• [x] issue #105
• [x] follows contribution guide
• [x] code change includes tests

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Name	Status	Preview	Comments	Updated (UTC)
raito	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 3, 2024 10:13am

[lomasson]

@m-kus Can you check ? but normally i've update all tests