Create a new apps page for silky home

- Change recent apps to the list view.
- Remove Conversations, Notifications and Permission manager.
- Remove Wireless emergency alerts and Special app access.
- Show App info preference if there's no recent apps.
- Show general category with recent apps.
- Use this page as the new apps entry on homepage for silky home.
- Make old apps page unsearchable when silky home is enabled.
- Exported new apps page in AndroidManifest.

Bug: 168166015
Bug: 174964405
Test: robotest & visual
Change-Id: I50d35a9d4723612214fce45a9e129fc175bc6831

AndroidManifest.xml

@@ -3205,6 +3205,15 @@
                        android:value="com.android.settings.applications.AppAndNotificationDashboardFragment"/>
         </activity>
 
+        <activity
+            android:name=".Settings$AppDashboardActivity"
+            android:label="@string/apps_dashboard_title"
+            android:icon="@drawable/ic_homepage_apps"
+            android:exported="true">
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                       android:value="com.android.settings.applications.AppDashboardFragment"/>
+        </activity>
+
         <activity
             android:name=".Settings$AccountDashboardActivity"
             android:label="@string/account_dashboard_title"