Expose styled and produce

Summary: To control bundle size and the amount of different versions used, we want plugins to use emotion's styled and immer's produce from flipper-plugin, rather than bringing their own

Reviewed By: passy

Differential Revision: D25087286

fbshipit-source-id: d2cc8b2cb1a17c520d05d99048cd94338984a913

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

@@ -31,7 +31,9 @@ test('Correct top level API exposed', () => {
       "TestUtils",
       "batch",
       "createState",
+      "produce",
       "renderReactRoot",
+      "styled",
       "theme",
       "usePlugin",
       "useValue",
@@ -47,6 +49,7 @@ test('Correct top level API exposed', () => {
       "DeviceLogListener",
       "DevicePluginClient",
       "DeviceType",
+      "Draft",
       "FlipperLib",
       "LogLevel",
       "MenuEntry",