Add torch Dataset classes

[gitttt-1234]

This is the first PR for #119. The torch Dataset modules for each model type is implemented. The user has the flexibility to choose the data pipeline framework: LitData or vanilla torch Datasets, which is passed as an argument while initializing sleap_nn.training.model_trainer.ModelTrainer class.

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[codecov]

Codecov Report

Attention: Patch coverage is 99.52381% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.61%. Comparing base (21b4f51) to head (22712ca).

Files with missing lines	Patch %	Lines
sleap_nn/data/custom_datasets.py	99.43%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##           divya/fix-normalization     #120      +/-   ##
===========================================================
+ Coverage                    97.51%   97.61%   +0.09%     
===========================================================
  Files                           38       39       +1     
  Lines                         3781     3981     +200     
===========================================================
+ Hits                          3687     3886     +199     
- Misses                          94       95       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[talmo]

Minor comments (except maybe the pafs sim ordering), otherwise looks fantastic!! Great work on the modularization and testing :)