ToggleGroupControl: Add disabled state

[mirka]

What problem does this address?

#57562 surfaced a use case for a disabled state for ToggleGroupControl.

What is your proposed solution?

• The styling could be similar to the isPressed Button component when it is disabled.
• As for the focus behavior when disabled, we may need an additional focusableWhenDisabled prop on ToggleGroupControl so consumers can choose.

[ciampo]

we may need an additional focusableWhenDisabled prop on ToggleGroupControl so consumers can choose.

We should probably keep an eye on the final decision made in #56547, so that we can ensure consistency in the prop naming and (potentially) default behaivior

[mirka]

@ciampo I accidentally confounded the two at first too, but this issue is for a disabled state on the entire component, not the individual options. This was the use case in BorderControl (#57562), where ideally I wanted to disable the entire ToggleGroupControl and maybe show a tooltip to explain why it was disabled.

[ciampo]

Got it! Let me know if you think it's worth working on it soon, while we're still fresh from other ToggleGroupControl work