Plugin Marketplace: Download plugin updates in background

Summary: Download updated plugins in background. This is implemented by periodical polling of Marketplace GraphQL API (interval 5 min by default). The feature is under GK flipper_plugin_auto_update, so for now it is enabled only for me.

Reviewed By: mweststrate

Differential Revision: D21863057

fbshipit-source-id: 51d8223ad4b2a928f7571ea480c10ba2efd9935d

desktop/app/src/dispatcher/fb-stubs/pluginAutoUpdate.tsx

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+export default () => {
+  // Auto-updates of plugins not implemented in public version of Flipper
+};