This function notifies MDCActionSheetController delegates that the (user-triggered) dismissal animation has completed and the action sheet is no longer on the screen.
PiperOrigin-RevId: 314974453
Add `MDCActionSheetControllerDelegate` to `MDCActionSheetController` with `actionSheetControllerDidDismiss:` so users of the ActionSheet component can react to dismissal.
Fixes#9147
- Examples do not need .h files, so those have been removed.
- Example filenames should match the format "<Component><Example>Example.(h|swift)". The Swift example has been clarified as a "Typical Use" example accordingly.
Conventions: https://github.com/material-foundation/material-foundation-conventions-objc
