Extend device plugin metadata to include supported devices

Summary: Plugin metadata format extended to include type of each plugin (client / device) and list of supported devices (android/ios/..., emulator/physical, etc). This will allow to detect plugins supported by device even if they are not installed and only available on Marketplace.

Reviewed By: mweststrate

Differential Revision: D26073531

fbshipit-source-id: e331f1be1af1046cd4220a286a1d52378c26cc53

desktop/plugins/reactdevtools/package.json

@@ -3,6 +3,10 @@
   "name": "flipper-plugin-react-devtools",
   "id": "React",
   "version": "0.0.0",
+  "pluginType": "device",
+  "supportedDevices": [
+    {"os": "Metro", "archived": false}
+  ],
   "main": "dist/bundle.js",
   "flipperBundlerEntry": "index.tsx",
   "license": "MIT",