refactor: expo sample app bundle identifier

Author: khushal87

examples/ExpoMessaging/app.json

@@ -18,10 +18,10 @@
     "ios": {
       "supportsTablet": true,
       "usesIcloudStorage": true,
-      "bundleIdentifier": "io.stream.expomessaging"
+      "bundleIdentifier": "io.stream.expomessagingapp"
     },
     "android": {
-      "package": "io.stream.expomessaging",
+      "package": "io.stream.expomessagingapp",
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",
         "backgroundColor": "#ffffff"