Add user and account dashboard category for new IA.

Add the initial version for the User & accounts category and set the
tile's intent if it contains metadata but fragment is null.

Test: RunSettingsRoboTests
Bug: 31801423
Change-Id: Ic63bf8aeaf47f68a184af73c9a8a72b89b597a17

src/com/android/settings/Settings.java

@@ -168,6 +168,7 @@ public class Settings extends SettingsActivity {
     public static class ConnectedDeviceDashboardActivity extends SettingsActivity {}
     public static class AppAndNotificationDashboardActivity extends SettingsActivity {}
     public static class StorageDashboardActivity extends SettingsActivity {}
+    public static class UserAndAccountDashboardActivity extends SettingsActivity {}
     public static class SystemDashboardActivity extends SettingsActivity {}
     public static class SupportDashboardActivity extends SettingsActivity {}