Separate suggestions and conditions.

This is the initial change for updating the suggestion cards:
- add a feature flag to swap between the new and current UI
- change suggestions to a standalone dashboard item. It becomes a
  horizontal scroll list that won't collapse/expand.
- the expand/collapse logic now only control the conditions list
- add draft for the new suggestion UI elements, but detail to fine-tune
to match the UI spec will come in following changes.

Bug: 70573674
Test: make RunSettingsRoboTests
Change-Id: I00c901e2598b26a34288fc73fd6031cc26a29ac6

src/com/android/settings/dashboard/DashboardFeatureProvider.java

@@ -88,4 +88,9 @@ public interface DashboardFeatureProvider {
      */
     void openTileIntent(Activity activity, Tile tile);
 
+    /**
+     * Whether or not we should use the v2 of suggestions UI.
+     */
+    boolean useSuggestionUiV2();
+
 }