Add initial settings for summarization

Test: SummarizationGlobalPreferenceControllerTest
Test: SummarizationPreferenceControllerTest
Flag: android.app.nm_summarization
Bug: 390415383
Change-Id: I773d69c707ae5f902860196fb44821ede15261f5

res/xml/summarization_notifications_settings.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2025 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"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:title="@string/notification_summarization_title">
+
+    <com.android.settingslib.widget.IllustrationPreference
+        android:key="illustration"
+        settings:searchable="false"
+        android:selectable="false"
+        app:lottie_cacheComposition="false"
+        settings:dynamicColor="true"/>
+
+    <com.android.settingslib.widget.TopIntroPreference
+        android:key="feature_description"
+        settings:searchable="false"
+        android:title="@string/notification_summarization_description"/>
+
+    <com.android.settingslib.widget.MainSwitchPreference
+        android:key="global_pref"
+        android:title="@string/notification_summarization_main_control_title"
+        settings:controller="com.android.settings.notification.SummarizationGlobalPreferenceController" />
+</PreferenceScreen>