support save/script/report operations for table designer (#1348)

* save changes

* rename

* new version of dacfx

src/Microsoft.SqlTools.ServiceLayer/TableDesigner/Contracts/Requests/GenerateScriptRequest.cs

@@ -0,0 +1,21 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+using Microsoft.SqlTools.Utility;
+
+namespace Microsoft.SqlTools.ServiceLayer.TableDesigner.Contracts
+{
+    /// <summary>
+    /// The service request to generate script for the changes.
+    /// </summary>
+    public class GenerateScriptRequest
+    {
+        /// <summary>
+        /// Request definition
+        /// </summary>
+        public static readonly RequestType<TableInfo, string> Type = RequestType<TableInfo, string>.Create("tabledesigner/script");
+    }
+}