batch for more efficient message processing

Summary: `unstablebatched_updates` should be used whenever a non-react originating event might affect multiple components, to make sure that React batches them optimally. Applied it to the most import events that handle incoming device events

Reviewed By: nikoant

Differential Revision: D25052937

fbshipit-source-id: b2c783fb9c43be371553db39969280f9d7c3e260

desktop/flipper-plugin/src/__tests__/api.node.tsx

@@ -29,6 +29,7 @@ test('Correct top level API exposed', () => {
       "Layout",
       "NUX",
       "TestUtils",
+      "batch",
       "createState",
       "renderReactRoot",
       "theme",