AppClone: Add preference to display new page Cloned Apps

Also adds a faeture flag and controller class for this page.
UX path: Apps > Cloned Apps

Bug: 249916503
Bug: 248235441
Test: manual
Test: make RunSettingsRoboTests -j30 ROBOTEST_FILTER=AppsPreferenceControllerTest
Test: make RunSettingsRoboTests -j30 ROBOTEST_FILTER=ClonedAppsPreferenceControllerTest
Change-Id: I2f68f4365ce08481c7db7bfdda4fdffc369321a9

src/com/android/settings/applications/ClonedAppsPreferenceController.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.applications;
+
+import static com.android.settings.core.SettingsUIDeviceConfig.CLONED_APPS_ENABLED;
+
+import android.content.Context;
+import android.provider.DeviceConfig;
+
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * A preference controller handling the logic for updating the summary of cloned apps.
+ */
+public class ClonedAppsPreferenceController extends BasePreferenceController {
+
+    public ClonedAppsPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        // todo(b/249916469): Update summary once we have mechanism of allowlisting available
+        //  for cloned apps.
+        return null;
+    }
+    @Override
+    public int getAvailabilityStatus() {
+        return DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_SETTINGS_UI,
+                CLONED_APPS_ENABLED, false) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+}