Support highlightable Settings homepage menu for 2-pane

1. Add a preference group adapter to perform highlighting
2. Add a class for mapping highlighable menu keys and preference keys
3. Add an API to determine if the screen is in split mode

Bug: 199017944
Test: manual, build
Change-Id: I8e3fe5fb96480a31ee0f3b3afb6ad78999d3d2bc

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

@@ -50,7 +50,7 @@ public class SearchFeatureProviderImpl implements SearchFeatureProvider {
         if (isSettingsPackage || isAllowlistedPackage) {
             return;
         }
-        throw new SecurityException("Search result intents must be called with from a "
+        throw new SecurityException("Search result intents must be called with from an "
                 + "allowlisted package.");
     }