Add toggle to hide private space entry point in All Apps

This change includes implementaion for below:
1. Add a preference inside private space settings page with a toggle switch to control hide/unhide
   private space entry in All Apps
2. Store the preference value in settingsprovider for persistence.

Bug: 302682054
Test: Manual
Change-Id: Ia1a56fc2c43550e23c00a61a5ce4742e42effcbe

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

@@ -0,0 +1,41 @@
+/*
+ * 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.app.settings.SettingsEnums;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+
+public class HidePrivateSpaceSettings extends DashboardFragment{
+    private static final String TAG = "HidePrivateSpaceSettings";
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.PRIVATE_SPACE_SETTINGS;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.privatespace_hide_locked;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+}