Add Plot ppc rootogram

[aloctavodia]

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📚 Documentation preview 📚: https://arviz-plots--142.org.readthedocs.build/en/142/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.98851% with 134 lines in your changes missing coverage. Please review.

Project coverage is 76.15%. Comparing base (602d554) to head (08268eb).

Files with missing lines	Patch %	Lines
src/arviz_plots/plots/ppcrootogramplot.py	8.65%	95 Missing ⚠️
src/arviz_plots/backend/matplotlib/__init__.py	61.53%	15 Missing ⚠️
src/arviz_plots/backend/plotly/__init__.py	11.11%	8 Missing ⚠️
src/arviz_plots/backend/bokeh/__init__.py	25.00%	6 Missing ⚠️
src/arviz_plots/backend/none/__init__.py	14.28%	6 Missing ⚠️
src/arviz_plots/visuals/__init__.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
- Coverage   78.88%   76.15%   -2.74%     
==========================================
  Files          29       30       +1     
  Lines        3386     3560     +174     
==========================================
+ Hits         2671     2711      +40     
- Misses        715      849     +134     

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