Add some pages to search index.

* Notification access page
* VR Listener page
* Feature flags in dev options
* QS Tile developer options
* User dictionary
* Billing cycle
* Some accessibilty pages

Bug: 70720645
Test: robotests
Change-Id: I4f7d3d65b2803cebf178ac345a79721232df707c

tests/robotests/src/com/android/settings/language/UserDictionaryPreferenceControllerTest.java

@@ -100,7 +100,7 @@ public class UserDictionaryPreferenceControllerTest {
         }
 
         private TestController(Context context) {
-            super(context);
+            super(context, "test_key");
         }
     }
 }