Command processing (5/n): Star plugin

Summary:
*Stack summary*: this stack refactors plugin management actions to perform them in a dispatcher rather than in the root reducer (store.tsx) as all of these actions has side effects. To do that, we store requested plugin management actions (install/update/uninstall, star/unstar) in a queue which is then handled by pluginManager dispatcher. This dispatcher then dispatches all required state updates.

*Diff summary*: refactored "star plugin" operation to perform it in pluginManager dispatcher.

Reviewed By: mweststrate

Differential Revision: D26305576

fbshipit-source-id: 90516af4e9ba8504720ddfa587f691f53e71b702

desktop/app/src/utils/__tests__/messageQueueSandy.node.tsx

@@ -12,7 +12,6 @@ import {createMockFlipperWithPlugin} from '../../test-utils/createMockFlipperWit
 import {Store, Client, sleep} from '../../';
 import {
   selectPlugin,
-  starPlugin,
   selectClient,
   selectDevice,
 } from '../../reducers/connections';
@@ -26,6 +25,7 @@ import {
   PluginClient,
   _SandyPluginInstance,
 } from 'flipper-plugin';
+import {starPlugin} from '../../reducers/pluginManager';
 
 type Events = {
   inc: {