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/flipper-plugin/src/test-utils/test-utils.tsx

@@ -390,6 +390,7 @@ export function createMockPluginDetails(
     dir: '',
     name: 'TestPlugin',
     specVersion: 0,
+    pluginType: 'client',
     entry: '',
     isBundled: false,
     isActivatable: true,