cc @DaveShuckerow

On Android, a re-orderable list will also present reorder options in the local context menu so that they can be accessed via alternative inputs. For an example, see the language selection in the Settings app. iOS presents similar options

We could expose an API to add local context actions which would need to callback into dart code. Alternatively we could only support a predefined list of local context actions and add them to the semantics widget.

To be as backwards compatible as possible, the implementation on the Android side would use the support libraries, but this seems to be blocked by #11099

Relevant Android APIs:
https://developer.android.com/reference/android/view/accessibility/AccessibilityNodeInfo.AccessibilityAction

Relevant iOS APIs:
https://developer.apple.com/documentation/uikit/accessibility/uiaccessibilityaction#//apple_ref/occ/instp/NSObject/accessibilityCustomActions