feat: ignore errors on dir scan

[mbsantiago]

This PR addresses an issue where iterator creation fails due to unreadable audio files. The changes ensure that such files are ignored, preventing crashes and improving robustness.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.81%. Comparing base (e794f2e) to head (8e612b6).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/audioclass/batch/base.py	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   91.01%   90.81%   -0.20%     
==========================================
  Files          17       17              
  Lines         590      599       +9     
  Branches       59       61       +2     
==========================================
+ Hits          537      544       +7     
- Misses         28       29       +1     
- Partials       25       26       +1     

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