Prompt user to Setup a device lock if not set

This add below changes on selecting private space setting:
1. Prompt user to setup device lock if not already set
2. If device lock is set authenticate user first before displaying private space settings page

Screenshot - https://screenshot.googleplex.com/4SrYHbBMJfVuoRy.png
https://screenshot.googleplex.com/6vNWm7Lg83vfnH8.png
RecordingLink - https://drive.google.com/file/d/1r4zb3ILPRqwvP5tlwfjQ9GgnDAW4vZg6/view?usp=drive_link

Bug: 289016927
Test: atest PrivateSpaceSettingsAuthenticatorTest , atest SecuritySettingsTest
Change-Id: I0e5dfb30213843c0dec60a17d01c30cd91db89b0
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 29d9d39..06e0143 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -4986,6 +4986,10 @@
             </intent-filter>
         </provider>
 
+        <activity android:name=".privatespace.PrivateSpaceAuthenticationActivity"
+                  android:theme="@*android:style/Theme.DeviceDefault.Settings.Dialog.NoActionBar"
+                  android:exported="false"/>
+
         <activity-alias android:name="UsageStatsActivity"
                         android:exported="true"
                         android:label="@string/testing_usage_stats"