Add support for custom row labels

[tpvasconcelos]

Add support for custom row labels (via a new row_labels argument) and deprecated the show_yticklabels argument.

related to #315

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📚 Documentation preview 📚: https://ridgeplot--333.org.readthedocs.build/en/333/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4da7ba2) to head (34ba839).
⚠️ Report is 122 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #333   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           18        18           
  Lines          646       655    +9     
  Branches        78        83    +5     
=========================================
+ Hits           646       655    +9     

Flag	Coverage Δ
combined-src	99.84% <100.00%> (+<0.01%)	⬆️

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[Copilot]

Pull Request Overview

This PR introduces support for custom row labels in ridgeline plots and deprecates the existing show_yticklabels parameter in favor of the new row_labels parameter. The new parameter allows users to specify custom labels for each row, automatically generate them from trace labels, or disable them entirely.

• Replace show_yticklabels boolean parameter with row_labels Collection[str] | None | Literal[False]
• Add deprecation warnings and migration logic for the old parameter
• Update documentation and examples to use the new parameter

Reviewed Changes

Copilot reviewed 9 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/ridgeplot/_ridgeplot.py	Added row_labels parameter, deprecated show_yticklabels, and added migration logic
src/ridgeplot/_figure_factory.py	Updated function signatures and logic to use row_labels instead of show_yticklabels
tests/unit/test_ridgeplot.py	Added comprehensive test coverage for the new row_labels functionality
tests/unit/test_figure_factory.py	Updated test to reflect the new function signature
tests/e2e/artifacts/basic_hist.json	Updated test artifact to reflect changes in y-axis tick formatting
tox.ini	Lowered code coverage threshold from 75% to 74%
Documentation and example files	Updated to use row_labels instead of labels parameter

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