Summary: Allow user to open the context menu on an element in the ax tree and request accessibility focus to that element. If the element is focusable (and talkback or another accessibility service is running), accessibility focus will change to that element, if not, it will not change anything.
Differential Revision: D9162382
fbshipit-source-id: 5dda9b87a2cc6eba4130e3feee978b5fa38ac9f1