Introduce FreeformWindowsPreferenceController

- Create new FreeformWindowsPreferenceController
 - Create controller inside the DashboardFragment
 - Port logic from DevelopmentSettings into the controller

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: I3ce3731a2aa37833c635e5bdaaf452491b2dadb5

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -411,6 +411,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         // inactive apps
         controllers.add(new AllowAppsOnExternalPreferenceController(context));
         controllers.add(new ResizableActivityPreferenceController(context));
+        controllers.add(new FreeformWindowsPreferenceController(context));
         controllers.add(new ShortcutManagerThrottlingPreferenceController(context));
         return controllers;
     }