Add debug page in Settings

Bug: 244122804
Test: manually build SettingsGoogle
Change-Id: I4853e17028dfe0eed4342b4691962b508bc87357

AndroidManifest.xml

@@ -4589,6 +4589,11 @@
             android:exported="false">
         </activity>
 
+        <activity
+            android:name="com.android.settings.spa.SpaDebugActivity"
+            android:exported="false">
+        </activity>
+
         <!-- This is the longest AndroidManifest.xml ever. -->
     </application>
 </manifest>

src/com/android/settings/spa/SpaDebugActivity.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2022 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.spa
+
+import com.android.settingslib.spa.framework.DebugActivity
+
+class SpaDebugActivity :
+    DebugActivity(SpaEnvironment.settingsEntryRepository, SpaActivity::class.java)