Add plot_rank_dist

[aloctavodia]

closes #16

This also add stats_kwargs argument to plot_rank.

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📚 Documentation preview 📚: https://arviz-plots--253.org.readthedocs.build/en/253/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.64748% with 13 lines in your changes missing coverage. Please review.

Project coverage is 70.96%. Comparing base (f9d004a) to head (4337384).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/arviz_plots/plots/rank_dist_plot.py	90.97%	12 Missing ⚠️
src/arviz_plots/plots/rank_plot.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
+ Coverage   69.30%   70.96%   +1.65%     
==========================================
  Files          41       42       +1     
  Lines        4721     4859     +138     
==========================================
+ Hits         3272     3448     +176     
+ Misses       1449     1411      -38     

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[aloctavodia]

Not sure how to fix the warnings. And I can't build docs locally, sphinx is giving me a "segmentation fault" (I thought I had solved this)

[OriolAbril]

looks good, left a comment to fix the docs warning.

To fix the doc build locally you might need to regenerate the env (it might have arviz-base installed from an old commit for example) so add -r when doing tox -e docs -r (after running the cleandocs job to make sure old caches aren't interfering)