Make value attribute and resetting the radio group public

[jordanjones243]

Is your feature request related to a problem? Please describe.

When thinking about form validation, users need the ability to query and set the value attribute programmatically. They also need the ability to reset the radio group at a moment's notice.

Describe the solution you'd like

Make the currently existing value attribute and resetRadio function public in order to give the users this functionality.

Describe alternatives you've considered

Leaving as is

Additional context

In the grand scheme of things, we want the users to be able to query the value and reset the state of any of our form elements. So, this implementation should be present in all form elements and that work should be considered/investigated when this ticket is picked up.

[jordanjones243]

This work will be handled in this ticket in auro-formkit:

• Add functionality to reset component to initial state auro-formkit#135