Add Slices Data object and DB Contract

Add in a Data object used to represent one row
in a new SQLite database used for building Slices.

The database has the following schema:
- Key
- Title
- Subtitle
- Screentitle
- Icon
- Fragment
- Controller

The key is the preference key.
Title, subtitle and Icon are for UI info.
Screentitle and fragment are for the intent.
Controller is used to get dynamic ui info (like summary),
and to take actions on the slice (like a toggle).

The actual indexing and a Slice will be handled in a subsquent CL,
but a prototype can be found here: ag/3324435

Test: robotests
Bug: 67996923
Change-Id: Id91deb58a3ab89ce1dab5a3f34cdb9ade6263aa8

tests/robotests/src/com/android/settings/search/SearchIndexProviderCodeInspector.java

@@ -43,13 +43,13 @@ public class SearchIndexProviderCodeInspector extends CodeInspector {
             "SettingsPreferenceFragment should implement Indexable, but these do not:\n";
     private static final String NOT_CONTAINING_PROVIDER_OBJECT_ERROR =
             "Indexable should have public field "
-                    + DatabaseIndexingManager.FIELD_NAME_SEARCH_INDEX_DATA_PROVIDER
+                    + DatabaseIndexingUtils.FIELD_NAME_SEARCH_INDEX_DATA_PROVIDER
                     + " but these are not:\n";
     private static final String NOT_SHARING_PREF_CONTROLLERS_BETWEEN_FRAG_AND_PROVIDER =
             "DashboardFragment should share pref controllers with its SearchIndexProvider, but "
                     + " these are not: \n";
     private static final String NOT_IN_INDEXABLE_PROVIDER_REGISTRY =
-            "Class containing " + DatabaseIndexingManager.FIELD_NAME_SEARCH_INDEX_DATA_PROVIDER
+            "Class containing " + DatabaseIndexingUtils.FIELD_NAME_SEARCH_INDEX_DATA_PROVIDER
                     + " must be added to " + SearchIndexableResources.class.getName()
                     + " but these are not: \n";
     private static final String NOT_PROVIDING_VALID_RESOURCE_ERROR =
@@ -173,7 +173,7 @@ public class SearchIndexProviderCodeInspector extends CodeInspector {
     private boolean hasSearchIndexProvider(Class clazz) {
         try {
             final Field f = clazz.getField(
-                    DatabaseIndexingManager.FIELD_NAME_SEARCH_INDEX_DATA_PROVIDER);
+                    DatabaseIndexingUtils.FIELD_NAME_SEARCH_INDEX_DATA_PROVIDER);
             return f != null;
         } catch (NoClassDefFoundError e) {
             // Cannot find class def, ignore