Creating Compound Metrics and Expanding our checkpointers (2/5)

[emersodb]

PR Type

Refactor

Short Description

This PR does a few fairly small things.

1. It slightly expands our checkpointing classes to have a class for checkpointing based on a metric. It also allows for naming the scoring function for a bit more informative logging.
2. It moves our TransformsMetric into a new file called compound_metrics.py, which will hold metrics that wrap metrics (hence the compound). EMAMetric, which will be added in the next PR, is another example of this kind of object.

Tests Added

Most of the changes are refactors, but I added extensive testing of the TransformsMetric class, as we didn't seem to have any prior to this.

[scarere]

Looks good to me

[lotif]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.95%. Comparing base (237b1e6) to head (7a3ec6e).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
+ Coverage   75.84%   75.95%   +0.10%     
==========================================
  Files         144      145       +1     
  Lines        8782     8809      +27     
==========================================
+ Hits         6661     6691      +30     
+ Misses       2121     2118       -3     

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