Integrate keyboard manager with settings v2[Part-2] (#2107)

* Added CustomAction Data Models

* Updated data model

* Updated Button command trigger for keyboard manager

* Integerated custom actions in Keyboard manager module backend

* Allow Runner to launch windows on foreground

* Refactor and moved the execution logic to background thread

* Removed non-required unlock calls

* Fixed typo

* Resolve PR comments

src/core/Microsoft.PowerToys.Settings.UI.Lib/CustomAction/SendCustomAction.cs

@@ -0,0 +1,35 @@
+// 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.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.Lib.CustomAction
+{
+    public class SendCustomAction
+    {
+        private readonly string moduleName;
+
+        public SendCustomAction(string moduleName)
+        {
+            this.moduleName = moduleName;
+        }
+
+        [JsonPropertyName("action")]
+        public ModuleCustomAction Action { get; set; }
+
+        public string ToJsonString()
+        {
+            var jsonSerializerOptions = new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = new CustomNamePolicy((propertyName) =>
+                {
+                    return propertyName.Equals("ModuleAction") ? moduleName : propertyName;
+                }),
+            };
+
+            return JsonSerializer.Serialize(this, jsonSerializerOptions);
+        }
+    }
+}