Suport device-open-app command

Summary: It is an escape hatch for testing iOS Sample app if `navigate('/')` cannot be made to work easily (D51394323)

Reviewed By: lblasa

Differential Revision: D51466697

fbshipit-source-id: fd6c2f37504807b4b634b85cb10e837523dadba8

desktop/flipper-common/src/server-types.tsx

@@ -288,6 +288,7 @@ export type FlipperServerCommands = {
     serial: string,
     appBundlePath: string,
   ) => Promise<void>;
+  'device-open-app': (serial: string, name: string) => Promise<void>;
   'device-forward-port': (
     serial: string,
     local: string,