Highlight the current talkback-focused element in the accessibility tree

Summary: Highlights the element corresponding to the view talkback is focused on in green in the ax tree (and updates live as talkback moves).

Reviewed By: blavalla

Differential Revision: D9021542

fbshipit-source-id: c3bf6f5625aacb0cd054032b33a50541b88b2eaf

src/ui/components/elements-inspector/ElementsInspector.js

@@ -37,6 +37,7 @@ export type ElementAttribute = {|
 export type ElementExtraInfo = {|
   nonAXWithAXChild?: boolean,
   linkedAXNode?: string,
+  focused?: boolean,
 |};
 
 export type Element = {|