Added new package "flipper-plugin-lib" which contains re-usable code related to plugin installation

Summary: No functional changes, just refactoring for easier implementation of plugin updates installation

Reviewed By: passy

Differential Revision: D21902525

fbshipit-source-id: fbfa221a89b879b0d08127676b27df65ef63307d

desktop/plugin-lib/src/index.ts

@@ -0,0 +1,11 @@
+/**
+ * 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 as PluginDetails} from './PluginDetails';
+export {default as getPluginDetails} from './getPluginDetails';