perf: use faster Walk implementation

[ekkolon]

Closes #

📑 Description

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[codecov-commenter]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (d1ed81e) 69.3% compared to head (c371379) 70.3%.

Files	Patch %	Lines
src/commands/verify.rs	0.0%	24 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##            main     #65     +/-   ##
=======================================
+ Coverage   69.3%   70.3%   +0.9%     
=======================================
  Files         25      25             
  Lines       2797    2760     -37     
=======================================
  Hits        1941    1941             
+ Misses       856     819     -37     

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