feat: Add pipeline evaluation module

[jsakv]

This PR introduce a dedicated module for streamlining evaluation of our scoring pipelines.

The new functions will allow to persist model performance :

• Add performance diagnosis plots

• Add classification reports (csv, json)

  Here is how it looks for now:

Let me know what you think!

[codecov[bot]]

Codecov Report

Merging #50 (07f40ca) into master (6908e55) will increase coverage by 0.57%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   95.36%   95.93%   +0.57%     
==========================================
  Files          23       25       +2     
  Lines         949     1033      +84     
==========================================
+ Hits          905      991      +86     
+ Misses         44       42       -2     

Flag	Coverage Δ
unittests	95.93% <100.00%> (+0.57%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyro_risks/__init__.py	100.00% <100.00%> (ø)
pyro_risks/config/datasets.py	100.00% <100.00%> (ø)
pyro_risks/evaluate.py	100.00% <100.00%> (ø)
pyro_risks/load.py	100.00% <100.00%> (ø)
pyro_risks/train.py	100.00% <100.00%> (+2.66%)	:arrow_up:

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[frgfm]

@dataJSA not sure if it was on purpose, but you didn't delete the remaining branch ;)