LitData Refactor PR4: Integrate LitData with ModelTrainer class

[gitttt-1234]

This is the fourth PR for #80. Here, we integrate litdata with training.model_trainer.ModelTrainer class. In _create_data_loaders(), ld.optimize(fn = get_chunks) is used to generate the .bin files. The .bin dir path is passed to the litdata.StreamingDataset class. (the .bin files are deleted after training)

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[codecov]

Codecov Report

Attention: Patch coverage is 89.07563% with 13 lines in your changes missing coverage. Please review.

Project coverage is 97.01%. Comparing base (6aad1f6) to head (019ced5).

Files with missing lines	Patch %	Lines
sleap_nn/training/model_trainer.py	85.39%	13 Missing ⚠️

Additional details and impacted files

@@                      Coverage Diff                       @@
##           divya/add-streamingdataset      #93      +/-   ##
==============================================================
- Coverage                       97.82%   97.01%   -0.82%     
==============================================================
  Files                              37       37              
  Lines                            3493     3515      +22     
==============================================================
- Hits                             3417     3410       -7     
- Misses                             76      105      +29     

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