feat(radio): component can be used outside of ion-item

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

An ion-radio with a label, must be used inside of an ion-item.

e.g.:

<ion-radio-group>
  <ion-item>
    <ion-label>My label</ion-label>
    <ion-radio></ion-radio>
  </ion-item>
</ion-radio-group>

Issue URL: Internal

See: #25660

What is the new behavior?

ion-radio can now be used outside of ion-item, using the new default slot to specify a label.

e.g.:

<ion-radio-group>
  <ion-radio>My label</ion-radio>
</ion-radio-group>

This PR is a combination of the following:

• feat(radio): add new properties and prepare for development #26485
• feat(radio): support label, placement, justify #26499
• 319c175 (adds TODO statements)

Does this introduce a breaking change?

• Yes
• No

Other information

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[liamdebeasi]

Great job!