DacFx import/export (#728)

Adding DacFx import/export/deploy/extract functionality

src/Microsoft.SqlTools.ServiceLayer/DacFx/Contracts/ExtractRequest.cs

@@ -0,0 +1,36 @@
+//
+// 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.ServiceLayer.TaskServices;
+using Microsoft.SqlTools.ServiceLayer.Utility;
+using System;
+
+namespace Microsoft.SqlTools.ServiceLayer.DacFx.Contracts
+{
+    /// <summary>
+    /// Parameters for a DacFx extract request.
+    /// </summary>
+    public class ExtractParams : DacFxParams
+    {
+        /// <summary>
+        /// Gets or sets the string identifier for the DAC application
+        /// </summary>
+        public string ApplicationName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the version of the DAC application
+        /// </summary>
+        public Version ApplicationVersion { get; set; }
+    }
+
+    /// <summary>
+    /// Defines the DacFx extract request type
+    /// </summary>
+    class ExtractRequest
+    {
+        public static readonly RequestType<ExtractParams, DacFxResult> Type =
+            RequestType<ExtractParams, DacFxResult>.Create("dacfx/extract");
+    }
+}