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

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

@@ -0,0 +1,40 @@
+/*
+ * 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.os.Bundle;
+
+import androidx.fragment.app.FragmentActivity;
+import androidx.navigation.fragment.NavHostFragment;
+
+import com.android.settings.R;
+import com.android.settings.SetupWizardUtils;
+
+import com.google.android.setupdesign.util.ThemeHelper;
+
+public class PrivateSpaceSetupActivity extends FragmentActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        setTheme(SetupWizardUtils.getTheme(this, getIntent()));
+        ThemeHelper.trySetDynamicColor(this);
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.privatespace_setup_root);
+        NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager()
+                .findFragmentById(R.id.ps_nav_host_fragment);
+        navHostFragment.getNavController().setGraph(R.navigation.privatespace_main_context_nav);
+    }
+}