Add prob plots to HLAPI

[samvanstroud]

Summary

This pull request introduces the following changes

• Add function to plot tagger probabiltity histograms in the high level api
• Add support for WP vlines in the tagger discriminant plots

Relates to the following issues

Conformity

• Changelog entry
• Documentation

[dkobylianskii]

This looks very nice, thanks!
I added some comments

[codecov-commenter]

Codecov Report

Merging #183 (da3f55e) into main (3941474) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   97.25%   97.28%   +0.03%     
==========================================
  Files          33       33              
  Lines        2875     2914      +39     
==========================================
+ Hits         2796     2835      +39     
  Misses         79       79              

Impacted Files	Coverage Δ
puma/tests/test_histogram.py	100.00% <ø> (ø)
puma/hlplots/results.py	94.79% <100.00%> (+0.85%)	⬆️
puma/hlplots/tagger.py	97.22% <100.00%> (+0.07%)	⬆️
puma/plot_base.py	90.30% <100.00%> (-0.09%)	⬇️
puma/tests/hlplots/test_results.py	99.32% <100.00%> (+0.06%)	⬆️

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[dkobylianskii]

If you have time, you can fix tests for hlplots. Otherwise, we can merge now, and I will fix the tests in the next MR.

[samvanstroud]

Thanks for the look @dkobylianskii, coverage should be fixed with the last two commits.