Adding support for calling into SystemNavigationGestureSettings

For taskbar pinning feasture we need to link user to navigation mode system settings,
this CL will create
- New NavigationModeSettingsActivity
- Intent Filter to invoke SystemNavigationGestureSettings

Test: Manual
Bug: 279069606
Flag: not needed
Change-Id: I55b47d158d18bcb075329f795f15b2e6fc2ea810

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -419,5 +419,6 @@ public class SettingsGateway {
             Settings.ModuleLicensesActivity.class.getName(),
             UserBackupSettingsActivity.class.getName(),
             Settings.MemtagPageActivity.class.getName(),
+            Settings.NavigationModeSettingsActivity.class.getName(),
     };
 }