Ignore .DS_Store files in dataset loading

[dylanperdigao]

Skip processing of .DS_Store files in dataset directory.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.48%. Comparing base (a4e8a45) to head (94f92fd).
⚠️ Report is 136 commits behind head on develop.

Files with missing lines	Patch %	Lines
tonic/datasets/dvs_lips.py	50.00%	1 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #325      +/-   ##
===========================================
- Coverage    77.07%   76.48%   -0.60%     
===========================================
  Files           54       48       -6     
  Lines         3067     2994      -73     
===========================================
- Hits          2364     2290      -74     
- Misses         703      704       +1     

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