Expose Toolbar from Sandy

Summary: Moved Toolbar to flipper-plugin. No further changes.

Reviewed By: nikoant

Differential Revision: D28027334

fbshipit-source-id: 35de13d87734ae3a8af037166945b1a669106274

desktop/flipper-plugin/src/index.ts

@@ -57,6 +57,7 @@ export {
 } from './ui/NUX';
 export {Sidebar as _Sidebar} from './ui/Sidebar';
 export {DetailSidebar} from './ui/DetailSidebar';
+export {Toolbar} from './ui/Toolbar';
 
 export {renderReactRoot} from './utils/renderReactRoot';
 export {