feature: labeledvideodataset returns clip start and end

[miraodasilva]

As suggested in my issue #59 by @kalyanvasudev . I've been using the repo with this change for a while now, never had any issues.

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[dasturge]

would like to see this get merged, anything holding it back?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.88%. Comparing base (e236b0b) to head (27dec8d).
⚠️ Report is 109 commits behind head on main.

Files with missing lines	Patch %	Lines
pytorchvideo/data/labeled_video_dataset.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #78   +/-   ##
=======================================
  Coverage   94.88%   94.88%           
=======================================
  Files         122      122           
  Lines        7442     7442           
=======================================
  Hits         7061     7061           
  Misses        381      381           

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