Set device features on device initialization

Summary:
1. Identify if device supports screenshots/screen recording when it is created.
2. Disable screen recording/screenshot buttons when they are not supported

Reviewed By: passy

Differential Revision: D34611133

fbshipit-source-id: 82ad2d67e4af482d9becf7995187667b5d99bc36

desktop/flipper-server-core/src/devices/DummyDevice.tsx

@@ -26,6 +26,10 @@ export default class DummyDevice extends ServerDevice {
       deviceType: 'dummy',
       title,
       os,
+      features: {
+        screenCaptureAvailable: false,
+        screenshotAvailable: false,
+      },
     });
   }
 }