Use arviz_example_data submodule

[sethaxen]

Description

Replaces stored example data with arviz_example_data based on arviz-devs/arviz_example_data#6. Note: this should not be merged until that PR is merged!

Checklist

• Follows official PR format
• New features are properly documented (with an example if appropriate)?
• Includes new or updated tests to cover the new feature
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

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📚 Documentation preview 📚: https://arviz--2096.org.readthedocs.build/en/2096/

[OriolAbril]

The azure errors seem related to this: https://docs.microsoft.com/en-us/azure/devops/pipelines/repos/github?view=azure-devops&tabs=yaml#checkout. IIUC, by default, submodules are not cloned, but I don't completely understand how to get them to clone

[sethaxen]

Thanks! Still some kinks to iron out for specific builds, but it seems to work for some of them now.

[OriolAbril]

Looks great already, let's merge arviz-devs/arviz_example_data#6 to make it easier, thanks for getting this started

[sethaxen]

@OriolAbril do you know how to tell black to skip the example_data directory? I tried to do it with pylintrc but it seems was not successful.

[OriolAbril]

It should be done from pyproject.toml. I think if you add something like this to the tool.black section:

extend_exclude = 'example_data'

ref: https://black.readthedocs.io/en/stable/usage_and_configuration/the_basics.html#configuration-format

[sethaxen]

The remaining errors seem to also occur on main and be unrelated to this PR. This is now ready for review.

[codecov]

Codecov Report

Merging #2096 (de5589d) into main (8a2bc39) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2096   +/-   ##
=======================================
  Coverage   90.78%   90.79%           
=======================================
  Files         117      117           
  Lines       12484    12488    +4     
=======================================
+ Hits        11334    11338    +4     
  Misses       1150     1150           

Impacted Files	Coverage Δ
arviz/data/datasets.py	98.48% <100.00%> (+0.09%)	⬆️

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[OriolAbril]

Thanks!

I also want to put on record that out of the last 4 PRs we have merged, 3 of them recuded the number of code lines while improving or maintaining functionality! 🎉