interpret support group effects

[GStechschulte]

This PR resolves the KeyError in PR #716. This error was the result of no default values being computed for model terms specified as group level effects. This is because group level effects do not have a components attribute, and thus never satisfied the logic in the set_default_values() function of ../interpret/utils.py.

Now, to compute default values, all unique common and group specific effects variable names are identified by accessing the components and factor attributes and are put into a list. From there, the data type is determined by identifying the data types used to fit the model which is then used to determine the function call (mean or mode for numeric and categorical dtypes, respectively).

Additionally, with group specific effects, when the user (or default values are computed) passes values, it is possible these values are new unseen data. Thus, I leverage PR #693 and add the arg sample_new_groups to the functions predictions, comparisons, and slopes (and the associated plotting functions) to allow plotting of new groups.

For a working example, view my last comment in PR #716.

To do:

• Add tests for new a model with group specific effects

[tomicapretto]

I would like to ask two things:

• Don't include anything related to the PR [715] Adding Mr P docs #716. As far as it is, this PR would add the notebook. I think it's because the branch was created from the branch in that PR. It should be created from the main branch.
• Could you add a test for the new supported cases? One reason why we didn't catch it before is that it was untested 😅

[codecov-commenter]

Codecov Report

Merging #721 (abed003) into main (16b005b) will increase coverage by 0.05%.
The diff coverage is 95.00%.

@@            Coverage Diff             @@
##             main     #721      +/-   ##
==========================================
+ Coverage   89.50%   89.56%   +0.05%     
==========================================
  Files          44       44              
  Lines        3526     3525       -1     
==========================================
+ Hits         3156     3157       +1     
+ Misses        370      368       -2     

Files Changed	Coverage Δ
bambi/interpret/plotting.py	84.96% <ø> (ø)
bambi/interpret/utils.py	87.68% <93.75%> (+0.92%)	⬆️
bambi/interpret/effects.py	89.24% <100.00%> (ø)

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[GStechschulte]

Yes, you are right. I checked out this branch from Nathaniel's branch. I have removed everything from that branch now. As for tests go, I have added a model with common and group effects. I test each plotting function in interpret for new unseen data and non-new observed data.

[tomicapretto]

Looks great! You can hit the green button! (squash and merge)