Allow each radio in radio group to be disabled/read-only

[benlister-okta]

DES-7006

Summary

• After refactoring in the read-only PR for radios, we inadvertently removed the ability to set individual radios as disabled (or read-only). This PR restores that functionality.
• Also adds a story demonstrating how to do this.

[bryancunningham-okta]

This is fine. But, wondering if we should use aria-disabled and prevent the user selection on our side. So that screen reader users will know this option exists but is disabled.

[benlister-okta]

This is fine. But, wondering if we should use aria-disabled and prevent the user selection on our side. So that screen reader users will know this option exists but is disabled.

That's a good point, but I'm wondering if that overlaps into the territory of the Read-only state.

[bryancunningham-okta]

That's a good point, but I'm wondering if that overlaps into the territory of the Read-only state.

I think that is what we want honestly. It should be the same for a non-sighted user. And in the disabled case, would have the disabled styling, as opposed to the readonly styling.

Not necessarily a blocker to this PR going in. Just something I think we should keep in mind for a future enhancement.