Add POST_NOTIFICATIONS permission for Android 13/T. (#3783)

Author: gsakakihara

firebase-messaging/src/main/AndroidManifest.xml

@@ -16,6 +16,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.google.firebase.messaging">
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+  <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
   <uses-permission android:name="android.permission.WAKE_LOCK" />
   <!-- Required by older versions of Google Play services to create IID tokens -->
   <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />