Minor improvements to the merkle tree package

[andrew-fleming]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.03%. Comparing base (4d40f5e) to head (82cf17f).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1213   +/-   ##
=======================================
  Coverage   92.03%   92.03%           
=======================================
  Files          49       49           
  Lines        1394     1394           
=======================================
  Hits         1283     1283           
  Misses        111      111           

Files with missing lines	Coverage Δ
packages/merkle_tree/src/hashes.cairo	88.88% <ø> (ø)
packages/merkle_tree/src/merkle_proof.cairo	82.35% <ø> (ø)

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[ericnordelo]

LGTM!