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

src/com/android/settings/slices/SlicesIndexer.java

@@ -116,6 +116,7 @@ class SlicesIndexer implements Runnable {
             values.put(IndexColumns.UNAVAILABLE_SLICE_SUBTITLE,
                     dataRow.getUnavailableSliceSubtitle());
             values.put(IndexColumns.PUBLIC_SLICE, dataRow.isPublicSlice());
+            values.put(IndexColumns.HIGHLIGHT_MENU_RESOURCE, dataRow.getHighlightMenuRes());
 
             database.replaceOrThrow(Tables.TABLE_SLICES_INDEX, null /* nullColumnHack */,
                     values);