Add __eq__ __hash__ to ABCTimestamps

[moi15moi]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 96.38554% with 3 lines in your changes missing coverage. Please review.

Project coverage is 97.87%. Comparing base (25de23c) to head (3cedf99).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
video_timestamps/fps_timestamps.py	83.33%	1 Missing ⚠️
video_timestamps/text_file_timestamps.py	87.50%	1 Missing ⚠️
video_timestamps/video_timestamps.py	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   97.97%   97.87%   -0.11%     
==========================================
  Files          16       16              
  Lines        1287     1364      +77     
==========================================
+ Hits         1261     1335      +74     
- Misses         26       29       +3     

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