Issue/178/metrics docs

[aimalz]

This addresses only the non-question aspects of #178.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (35aeb0b) 100.00% compared to head (7ac5643) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #181   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines         2280      2280           
=========================================
  Hits          2280      2280           

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/qp/metrics/array_metrics.py	100.00% <ø> (ø)
src/qp/metrics/brier.py	100.00% <ø> (ø)
src/qp/metrics/metrics.py	100.00% <100.00%> (ø)

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[drewoldag]

I'm sorry I took so long to review this, it fell off my radar. This looks good. You can really tell I didn't know what I was docstring'ing when I put this together initially :)