feat(jstz_crypto): get hash of public keys

[huancheng-trili]

Context

Part of JSTZ-247.
JSTZ-247

In preparation for #721.

Description

Get public key hashes from public keys.

Manually testing the PR

• Unit testing: added one test

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.93%. Comparing base (402aa9b) to head (7df151a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/jstz_crypto/src/public_key.rs	95.23%	1 Missing ⚠️

Files with missing lines	Coverage Δ
crates/jstz_crypto/src/public_key.rs	54.31% <95.23%> (+9.51%)	⬆️

... and 1 file with indirect coverage changes

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