Revise homepage highlight mechanism

- Create TopLevelHighlightMixin to handle highlight actions and simplify
  TopLevelSettings
- Fix the error highlight and the flicker after screen rotation
- Postpone creating the fragment until it's needed to accelerate the
  initialization and to fix the search highlight function breakage after
  toggling light/dark mode
- Register activity embedding rules only once for injection and
  wallpaper
- Do not highlight Tips & support since it's full screen
- Refactor ActivityEmbeddingRulesController

Bug: 207316936
Test: manual, robotest build pass
Change-Id: If322ec180b03ee123987c70779a25c6a570d9faf

src/com/android/settings/search/SearchResultTrampoline.java

@@ -109,7 +109,8 @@ public class SearchResultTrampoline extends Activity {
             final SettingsHomepageActivity homeActivity =
                     ((SettingsApplication) getApplicationContext()).getHomeActivity();
             if (homeActivity != null) {
-                homeActivity.getMainFragment().setHighlightMenuKey(highlightMenuKey);
+                homeActivity.getMainFragment().setHighlightMenuKey(highlightMenuKey,
+                        /* scrollNeeded= */ true);
             }
         } else {
             // Two-pane case