Feature radio group css part

[ashleybiermannalaska]

Alaska Airlines Pull Request

Adds radio-group css part. This part allows for the fieldset to be accessed in the shadow dom.

This change was initiated as part of a bug reported for Remove spacing below radio group. After it was determined that the issue was not a bug, it was decided to add a new feature to support accessing the radio group within the shadow dom.

Fixes: # (issue, if applicable) Related to Remove spacing below radio group. Note: The initial bug request to remove the spacing below the radio group can be completed without adjusting the radio-group css part in the shadow dom.

Summary:

Add support for customizing radio-group.

Type of change:

Please delete options that are not relevant.

• [x] New capability

Checklist:

• [x] My update follows the CONTRIBUTING guidelines of this project
• [x] I have performed a self-review of my own update

By submitting this Pull Request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Pull Requests will be evaluated by their quality of update and whether it is consistent with the goals and values of this project. Any submission is to be considered a conversation between the submitter and the maintainers of this project and may require changes to your submission.

Thank you for your submission!
-- Auro Design System Team

[CLAassistant]

All committers have signed the CLA.

[ashleybiermannalaska]

Marked PR as draft - needs to be updated with proper commit messages

[jordanjones243]

This PR will be closed out and the work will be handled/completed in this PR: https://github.com/AlaskaAirlines/auro-radio/pull/111