Simplify Model Summary Function

[aymanzay]

• Cleaned up functions in train/util.py: train_model() and get_model_summary().
• Added documentation and updated dependencies.

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Feature Addition

• In 'learn_model(): users can now input a dest_file/model path in a non-existent subdirectory. If path to model does not already exist, it will create the directory path.

Refactoring Changes

• Utilizing get_loglikelihoods() to reduce repeated code when computing training and validation loglikes.
• Added some comments to wrapper.

[codecov[bot]]

Codecov Report

Merging #67 into wrapper-cleanup will increase coverage by 0.25%. The diff coverage is 91.66%.

@@                 Coverage Diff                 @@
##           wrapper-cleanup      #67      +/-   ##
===================================================
+ Coverage            86.27%   86.53%   +0.25%     
===================================================
  Files                    8        8              
  Lines                  612      594      -18     
  Branches               145      130      -15     
===================================================
- Hits                   528      514      -14     
  Misses                  46       46              
+ Partials                38       34       -4     

Impacted Files	Coverage Δ
moseq2_model/gui.py	100.00% <ø> (ø)
moseq2_model/train/util.py	92.66% <90.90%> (+1.96%)	:arrow_up:
moseq2_model/helpers/wrappers.py	88.70% <100.00%> (+0.37%)	:arrow_up:

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