feat: implement is_empty for UpdatedSkeletonTreeImpl

[dorimedini-starkware]

This change is 

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 62.01%. Comparing base (15f126d) to head (f72c995).

Files	Patch %	Lines
...patricia_merkle_tree/updated_skeleton_tree/tree.rs	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
- Coverage   62.27%   62.01%   -0.27%     
==========================================
  Files          35       35              
  Lines        1662     1669       +7     
  Branches     1662     1669       +7     
==========================================
  Hits         1035     1035              
- Misses        578      585       +7     
  Partials       49       49              

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[TzahiTaub]

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

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crates/committer/src/patricia_merkle_tree/updated_skeleton_tree/tree.rs line 86 at r2 (raw file):

    fn is_empty(&self) -> bool {
        let empty = self.skeleton_tree.is_empty();

non blocking, I like it better with the is prefix

Suggestion:

let is_empty

[dorimedini-starkware]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dorimedini-starkware)

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crates/committer/src/patricia_merkle_tree/updated_skeleton_tree/tree.rs line 86 at r2 (raw file):

Previously, TzahiTaub (Tzahi) wrote…

non blocking, I like it better with the is prefix

done