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/HidePrivateSpaceSummaryController.java

@@ -0,0 +1,57 @@
+/*
+ * 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 static android.provider.Settings.Secure.HIDE_PRIVATESPACE_ENTRY_POINT;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+
+/**
+ * Represents the preference controller for (un)hiding Private Space entry point in All Apps and
+ * shows On/Off summary depending upon the settings provider value.
+ */
+public final class HidePrivateSpaceSummaryController extends BasePreferenceController {
+    public HidePrivateSpaceSummaryController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return 0;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return isHidden() ? mContext.getString(R.string.privatespace_hide_on_summary)
+                : mContext.getString(R.string.privatespace_hide_off_summary);
+    }
+
+    private boolean isHidden() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                HIDE_PRIVATESPACE_ENTRY_POINT, 0) == 1;
+    }
+}