Start private space setup when there is no private space set

This change handles as below based on if private space already exists on device:
1. If PS doesn't exist then start the setup flow which shows a PS education screen. On setup button creates the private space.
2. If PS already exists on device then display PS settings page.

Bug: 299069146
Test: atest PrivateSpaceSettingsAuthenticatorTest
Change-Id: I46bdbaeb0210fd5b41a426f852e3f455b62c1c29

res/xml/privatespace_setup_education_entries.xml

@@ -0,0 +1,39 @@
+<?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.
+  -->
+
+<ItemGroup
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <Item
+        android:enabled="false"
+        android:icon="@drawable/ic_apps"
+        android:title="@string/privatespace_access_bottom_text"
+        app:sudIconTint="?android:attr/textColorSecondary"/>
+
+    <Item
+        android:enabled="false"
+        android:icon="@drawable/ic_lock_24dp"
+        android:title="@string/privatespace_protected_lock_text"
+        app:sudIconTint="?android:attr/textColorSecondary"/>
+
+    <Item
+        android:enabled="false"
+        android:icon="@drawable/ic_notifications"
+        android:title="@string/privatespace_hidden_notifications_text"
+        app:sudIconTint="?android:attr/textColorSecondary"/>
+</ItemGroup>