fix(stm): Fix the implementation difference for schnorr signature between cpu and circuit

[damrobi]

Content

This PR includes a fix to the implementation of the unique schnorr signature that differs between cpu and circuit. This fix mainly consists in modifying the input to the sign and verify functions of the unique_schnorr_signature module to take BaseFieldElements instead of arbitrary bytes. The bytes that were previously handled within the sign function will be treated outside of the signature in a later PR.
Warning: This PR does not include the proper handling of the message bytes and merkle root before giving them to the signature function!

Content of the PR:

• Changed hash_to_projective_point to have BaseFieldElement as inputs
• Modified inputs of sign and verify functions to take &[BaseFieldElement] instead of &[u8]
• Exposed BaseFieldElement to the benches
• Added From<&[u8;32]> implementation to BaseFieldElement for testing only

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • CHANGELOG file is updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • All check jobs of the CI have succeeded
  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • No new TODOs introduced

Comments

Issue(s)

Relates to #2993

[github-actions]

Test Results

    5 files  ±0    172 suites  ±0   39m 52s ⏱️ +10s
2 513 tests ±0  2 513 ✅ +7  0 💤 ±0  0 ❌  - 7 
7 783 runs  ±0  7 783 ✅ +7  0 💤 ±0  0 ❌  - 7 

Results for commit 5d48fba. ± Comparison against base commit 78d4c0d.

♻️ This comment has been updated with latest results.