feat(base_layer): add safe conversion to felt

[giladchase]

commit-id:a4bb6349

---

Stack:

• refactor(base_layer): remove optional finality #869
• feat(base_layer): add safe conversion to felt #856 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

---

This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.31%. Comparing base (7da2d63) to head (62d84d3).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...rus_base_layer/src/ethereum_base_layer_contract.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #856      +/-   ##
==========================================
+ Coverage   74.29%   74.31%   +0.01%     
==========================================
  Files         358      358              
  Lines       36288    36226      -62     
  Branches    36288    36226      -62     
==========================================
- Hits        26960    26921      -39     
+ Misses       7190     7167      -23     
  Partials     2138     2138              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[elintul]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dan-starkware and @giladchase)

---

crates/papyrus_base_layer/src/ethereum_base_layer_contract.rs line 36 at r1 (raw file):

    #[error(transparent)]
    FeltParseError(#[from] felt::FromStrError),
}

Keep alphabetized?

[elintul]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dan-starkware and @giladchase)

[elintul]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dan-starkware and @giladchase)

[elintul]

Reviewed 1 of 1 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dan-starkware)