PR Summary

This implements arguments to override the styling ofCheckButtons andRadioButtons, in a manner similar to the existingToolHandles orSelectors. This depends on#23457 to avoid the conflicts on the arguments. I updated the examples to show what this looks like, but not the tests or documentation yet. I have two questions:

1. Are the argument names reasonable?
2. What to do about the label properties? The other items are put inscatter, whichdoes have aCollection, so they acceptdict with elements that are singular or lists. However, we don't have aTextCollection, so I had to make it take adict orlist of dict. This seems inconsistent, so perhaps I should attempt to implement the former input here?

Fixes#24583

PR Checklist

Documentation and Tests

• Has pytest style unit tests (andpytest passes)
• Documentation is sphinx and numpydoc compliant (the docs shouldbuild without error).
• New plotting related features are documented with examples.

Release Notes

• New features are marked with a.. versionadded:: directive in the docstring and documented indoc/users/next_whats_new/
• API changes are marked with a.. versionchanged:: directive in the docstring and documented indoc/api/next_api_changes/
• Release notes conform with instructions innext_whats_new/README.rst ornext_api_changes/README.rst