[Regional Pref] 1. Add metrics for user changes the First day of week 2.

Refactor to Settings design

Bug: 275003276
Bug: 264483854
Change-Id: Ibea987b6e51fd76c89a0ff5269da6e99171f6b1c

res/xml/regional_preference_main_page.xml

@@ -49,7 +49,7 @@
         android:title="@string/first_day_of_week_preferences_title"
         android:summary="@string/default_string_of_regional_preference"
         settings:controller="com.android.settings.regionalpreferences.FirstDayOfWeekController"
-        settings:fragment="com.android.settings.regionalpreferences.RegionalPreferencesFragment">
+        settings:fragment="com.android.settings.regionalpreferences.FirstDayOfWeekItemFragment">
         <extra
             android:name="arg_key_regional_preference"
             android:value="fw" />

res/xml/regional_preferences_first_day_of_week.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2023 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.
+-->
+
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res-auto"
+    android:title="@string/first_day_of_week_preferences_title">
+
+    <com.android.settingslib.widget.TopIntroPreference
+        android:title="@string/regional_preferences_option_page_sub_title"
+        android:persistent="false" />
+
+    <PreferenceCategory
+        android:key="first_day_of_week_item_category"
+        android:title="@string/summary_placeholder"
+        android:layout="@layout/preference_category_no_label"
+        settings:controller="com.android.settings.regionalpreferences.FirstDayOfWeekItemCategoryController"/>
+
+</PreferenceScreen>