Add Foreground/Background handlers for ToastActivation (#1973)

* Adding temp idl for base branch

* Create .cpp/.h files for handling toastnotifications

* Introduce ToastNotification Registration APIs (#1875)

* Introduce ToastRegistration APIs and associated taef tests

* Address comments

* Address minor comments

* Add support for Release x64 for ToastNotificationTestApp

* Addressing nits

* Add GetActivatorGuid function

* Last nits

* Update error messages

Co-authored-by: Paul Purifoy <purifoypaul@microsoft.com>

* Copy branch based on WNP_ToastNotifications

* Address nit

* Addressing nits

* Address nits

* Change name from ToastActivation->AppNotification

* Change more constants

* Reuse deserialize function

Co-authored-by: Sharath Manchala <10109130+sharath2727@users.noreply.github.com>

Author: pmpurifoy

test/TestApps/ToastNotificationsTestApp/main.cpp

@@ -35,6 +35,17 @@ winrt::ToastNotification GetToastNotification()
     return winrt::ToastNotification(xmlDocument);
 }
 
+bool BackgroundActivationTest() // Activating application for background test.
+{
+    return true;
+}
+
+bool UnregisterBackgroundActivationTest()
+{
+    winrt::ToastNotificationManager::Default().UnregisterActivator();
+    return true;
+}
+
 bool VerifyFailedRegisterActivatorUsingNullClsid()
 {
     try

test/TestApps/ToastNotificationsTestAppPackage/Package.appxmanifest

@@ -50,7 +50,7 @@
       <com:Extension Category="windows.comServer">
         <com:ComServer>
           <com:ExeServer Executable="ToastNotificationsTestApp\ToastNotificationsTestApp.exe" DisplayName="SampleBackgroundApp" Arguments="----ToastActivated:">
-            <com:Class Id="1940DBA9-0F64-4F0D-8A4B-5D207B812E61" DisplayName="Windows App Runtime Toast" />
+            <com:Class Id="1940dba9-0f64-4f0d-8a4b-5d207b812e61" DisplayName="Windows App Runtime Toast" />
           </com:ExeServer>
         </com:ComServer>
       </com:Extension>