[Dynamic Home] Make a new page for all top level settings

Since we are moving conditionals/suggestions to a different place, there
is no need to use DashboardSummary to display top level settings any
more. We can simplify a lot of code for top level settings and reduce it
to a standard DashboardFragment.

- Create a new DashboardFragment + xml for all top level internal items
- Add a PreferenceController to provide summary for Network & internet
  item.
- Mark a bunch of things deprecated for future work.

Bug: 110405144
Test: robotests
Change-Id: I9f778777131c28eb836b722e089e026a59f5ddc6

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

@@ -42,6 +42,12 @@ import com.android.settingslib.utils.ThreadUtils;
 import java.lang.reflect.Field;
 import java.util.List;
 
+/**
+ * TODO(b/110405144): Remove this when all top level settings are converted to PreferenceControllers
+ *
+ * @deprecated
+ */
+@Deprecated
 public class SummaryLoader {
     private static final boolean DEBUG = DashboardSummary.DEBUG;
     private static final String TAG = "SummaryLoader";