Method onChildAdded

packages/firebase-database/index.android.ts:224–228

(param0: com.google.firebase.database.DataSnapshot, param1: string)

			handle = this.native.addChildEventListener(
				new com.google.firebase.database.ChildEventListener({
					onChildAdded(param0: com.google.firebase.database.DataSnapshot, param1: string) {
						if (eventType === 'child_added') {
							callback?.(DataSnapshot.fromNative(param0), param1);
						}
					},
					onChildChanged(param0: com.google.firebase.database.DataSnapshot, param1: string) {
						if (eventType === 'child_changed') {
							callback?.(DataSnapshot.fromNative(param0), param1);