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/test-utils/createMockFlipperWithPlugin.tsx

@@ -18,7 +18,6 @@ import {queries} from '@testing-library/dom';
 
 import {
   selectPlugin,
-  starPlugin,
   selectDevice,
   selectClient,
 } from '../reducers/connections';
@@ -32,6 +31,7 @@ import {PluginDefinition} from '../plugin';
 import PluginContainer from '../PluginContainer';
 import {getPluginKey, isDevicePluginDefinition} from '../utils/pluginUtils';
 import MockFlipper from './MockFlipper';
+import {starPlugin} from '../reducers/pluginManager';
 
 export type MockFlipperResult = {
   client: Client;