Get device by serial

Summary: Introduce a new API to obtain devices by serial, if any.

Reviewed By: antonk52

Differential Revision: D55797515

fbshipit-source-id: a341d08f75e6f7ed9f989acee809c7066212932b

desktop/flipper-server/src/FlipperServerImpl.tsx

@@ -727,6 +727,10 @@ export class FlipperServerImpl implements FlipperServer {
     }
   }
 
+  getDeviceWithSerial(serial: string): ServerDevice | undefined {
+    return this.devices.get(serial);
+  }
+
   getDeviceSerials(): string[] {
     return Array.from(this.devices.keys());
   }