Agent configuration support classes (WIP) (#632)

* Additional SQL Agent config classes (WIP)

* Fix build breaks

* Clean up job step code

* Add VS Code build files

* Move changes to other machine

* More of the action execution classes

* More execution processing refactors

* More refactoring

* Disable tests for WIP merge

* Fix break on Release config

* Stage changes to other machine.

src/Microsoft.SqlTools.ServiceLayer/Management/Common/ServerSwitchingAttribute.cs

@@ -0,0 +1,35 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+
+namespace Microsoft.SqlTools.ServiceLayer.Management
+{
+    /// <summary>
+    /// Custom attribute that can be applied on particular DB commander to
+    /// indicate whether the base class should switch SMO servers before 
+    /// execution or not.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class)]
+    public sealed class ServerSwitchingAttribute : Attribute 
+    {
+        private bool needToSwitch = false;
+
+        private ServerSwitchingAttribute() {}
+
+        public ServerSwitchingAttribute(bool needToSwitchServer) 
+        {
+            this.needToSwitch = needToSwitchServer;
+        }
+
+        public bool NeedToSwtichServerObject 
+        {
+            get 
+            {
+                return this.needToSwitch;
+            }
+        }
+    }
+}