Use flag to control the hierarchy tree changes

This change includes these:
1. App languages
2.Regional preferences
2-1. Temperature
2-2. First day of week
2-3. Numbering system
3. Terms of address

Bug: 379962955
Flag: com.android.settings.flags.regional_preferences_api_enabled
Test: check hsv and atest TermsOfAddressCategoryControllerTest,
FirstDayOfWeekControllerTest, NumberingSystemControllerTest, TemperatureUnitControllerTest
Change-Id: I9ae376f24ac4d1cf9a186ad3d77b539ac4b83642

Change-Id: I1b2f508f618fba94e67b5f8b102620837a6dda1c

src/com/android/settings/language/MoreLanguagesSettingsCategoryController.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2024 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.language;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+
+import com.android.settings.flags.Flags;
+import com.android.settings.widget.PreferenceCategoryController;
+
+public class MoreLanguagesSettingsCategoryController extends PreferenceCategoryController {
+
+    public MoreLanguagesSettingsCategoryController(@NonNull Context context, @NonNull String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (Flags.regionalPreferencesApiEnabled()) {
+            return AVAILABLE;
+        }
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+}