Add Private Space settings page

This involves:
1. Adding a new page for PS settings under Security & Privacy
2. Integrating the PS safety source with SafetyCenter.

Also, add the capability to create and delete PS from the page.
Creation is temporary to help with prototyping, and will be removed
finally.

Screenshots:
Private Space Entry point in Security & Privacy Settings:
https://screenshot.googleplex.com/4VHxNekjhxZHJwF

Private Space Settings page:
https://screenshot.googleplex.com/3Raw4wuymTHTgtM

Creating Private Space:
https://screenshot.googleplex.com/3dvzAH6V4kQmuYf

Private Space created:
https://screenshot.googleplex.com/Aj7nnF9uuUCa9Q5

Design doc:
https://docs.google.com/document/d/1CdjUjAE84-5ZEPRIfw5KYFjLVHtEZxc_sF0w95su8DA/edit?usp=sharing&resourcekey=0-dAACT9HRexY1IyoxMmkVlw

Bug: 286539356
Bug: 293569406
Test: manual
Test: atest DeletePrivateSpaceControllerTest
Test: atest UseOneLockControllerTest
Test: atest HidePrivateSpaceControllerTest
Change-Id: I9caf8e04e7fb2df36e60f607225e2931988ee692

src/com/android/settings/privatespace/HidePrivateSpaceController.java

@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+
+package com.android.settings.privatespace;
+
+import android.content.Context;
+
+import com.android.settings.core.TogglePreferenceController;
+
+/** Represents the preference controller for (un)hiding the Private Space */
+public final class HidePrivateSpaceController extends TogglePreferenceController {
+    public HidePrivateSpaceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        // TODO(b/293569406) Need to check this from a persistent store, maybe like SettingsProvider
+        return false;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        // TODO(b/293569406) Need to save this to a persistent store, maybe like SettingsProvider
+        return true;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return 0;
+    }
+}