Support slice deep links highlighting menu entries

- Add an interface to get highlight menu key resource in Sliceable
- Force implementing the new interface in TogglePreferenceController and
  CustomSliceable at syntax level
- Update the slice index db schema

Bug: 204695404
Test: manual, robotest build pass, unit
Change-Id: I0b5068bccd04f1590023de7f3385bc0a4c6fa47b

tests/robotests/src/com/android/settings/slices/SliceBroadcastReceiverTest.java

@@ -322,6 +322,8 @@ public class SliceBroadcastReceiverTest {
         values.put(SlicesDatabaseHelper.IndexColumns.FRAGMENT, SliceTestUtils.FAKE_FRAGMENT_NAME);
         values.put(SlicesDatabaseHelper.IndexColumns.CONTROLLER, controllerClass);
         values.put(SlicesDatabaseHelper.IndexColumns.SLICE_URI, buildUri(key).toSafeString());
+        values.put(SlicesDatabaseHelper.IndexColumns.HIGHLIGHT_MENU_RESOURCE,
+                SliceTestUtils.FAKE_HIGHLIGHT_MENU_RES);
         mDb.replaceOrThrow(SlicesDatabaseHelper.Tables.TABLE_SLICES_INDEX, null, values);
     }