[Launcher] Use a keyboard hook in the runner to invoke the Launcher (#6660)

* Added a keyboard hook to the runner

* Update RootKeyboardHook

* Enable reading the whole JsonObject property

* Renamed RootKeyboardHook to CentralizedKeyboardHook

* Fixed build break, changed callback return type to bool

* Added Hotkey struct which somehow went missing

+ Cherry-pick fixes

* Reorganized the kb hook

* Basic version works

* Various fixes

* Finishing touches

* Fix potential threading issue

* int -> size_t

* Add default initializers to the Hotkey struct

* Added a suggested comment

* Unified a constant

* Use C# classes instead of native calls for sync

* Added a claryfing comment

* Use std::move

* Renamed a method

* Possible fix for compilation errors

* Fix a regression

* Show a message on failure

* Added DISABLE_LOWLEVEL_HOOK support

* Allow running Launcher as standalone

* Rename string constants

src/modules/launcher/PowerLauncher/Helper/NativeEventWaiter.cs

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Threading;
+using System.Windows;
+
+namespace PowerLauncher.Helper
+{
+    public static class NativeEventWaiter
+    {
+        public static void WaitForEventLoop(string eventName, Action callback)
+        {
+            new Thread(() =>
+            {
+                var eventHandle = new EventWaitHandle(false, EventResetMode.AutoReset, eventName);
+                while (true)
+                {
+                    if (eventHandle.WaitOne())
+                    {
+                        Application.Current.Dispatcher.Invoke(callback);
+                    }
+                }
+            }).Start();
+        }
+    }
+}