Adding alarms and reminders activity

Adding a settings screen to control the permission SCHEDULE_EXACT_ALARM.
Apps can start this by starting a newly introduced API intent
REQUEST_SCHEDULE_EXACT_ALARM.

Test: make -j RunSettingsRoboTests
Manually by UI inspection:
Settings -> Apps -> Special App access -> Alarms and Reminders
or by running:
adb shell am start -a android.settings.REQUEST_SCHEDULE_EXACT_ALARM

Bug: 171306433
Bug: 171305516
Change-Id: I1293d38fc50a22b2af46f80ab24f676ed632f964

res/xml/alarms_and_reminders.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021 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"
+                  android:title="@string/alarms_and_reminders_title">
+
+    <com.android.settings.widget.FilterTouchesRestrictedSwitchPreference
+        android:key="alarms_and_reminders_switch"
+        android:title="@string/alarms_and_reminders_switch_title" />
+
+    <com.android.settingslib.widget.FooterPreference
+        android:key="alarms_and_reminders_description"
+        android:title="@string/alarms_and_reminders_footer_title"
+        android:selectable="false" />
+
+</PreferenceScreen>

res/xml/special_access.xml

@@ -112,6 +112,16 @@
             android:value="com.android.settings.Settings$ManageExternalSourcesActivity" />
     </Preference>
 
+    <Preference
+        android:key="alarms_and_reminders"
+        android:title="@string/alarms_and_reminders_title"
+        android:fragment="com.android.settings.applications.manageapplications.ManageApplications"
+        settings:keywords="@string/keywords_alarms_and_reminders">
+        <extra
+            android:name="classname"
+            android:value="com.android.settings.Settings$AlarmsAndRemindersActivity" />
+    </Preference>
+
     <Preference
         android:key="special_app_usage_access"
         android:title="@string/usage_access"