plot_converge_dist: Add grouped argument

[aloctavodia]

All variables together

azp.plot_convergence_dist(data)

Only "za_county" and "a" variables

azp.plot_convergence_dist(data),  var_names=["za_county", "a"])

Only "za_county" and "a" variables, not together

azp.plot_convergence_dist(data),  var_names=["za_county", "a"], grouped=False)

This will fail for kind="ecdf" but work for the rest. The reason is that "g" has a different shape than ("za_county" or "a"). This should be fixed in arviz-stats.

azp.plot_convergence_dist(data),  kind="hist", var_names=["za_county", "a", "g"], grouped=False)

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📚 Documentation preview 📚: https://arviz-plots--182.org.readthedocs.build/en/182/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.

Project coverage is 73.56%. Comparing base (76fa269) to head (b739acc).

Files with missing lines	Patch %	Lines
src/arviz_plots/plots/convergencedistplot.py	71.42%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
- Coverage   73.62%   73.56%   -0.07%     
==========================================
  Files          34       34              
  Lines        3939     3960      +21     
==========================================
+ Hits         2900     2913      +13     
- Misses       1039     1047       +8     

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[AlexAndorra]

Great addition @aloctavodia ! Left two comments

[aloctavodia]

Thanks @AlexAndorra. Fixed