Add v2 of the Hosting Service and build nuget packages for it (#675)

* Port v2 of Hosting service to SqlToolsService
- Renamed project to .v2 so that existing hosted service isn't impacted
- Copied over the CoreServices project which contains ConnectionServiceCore and other reusable services for anything interacting with MSSQL
- Ported unit test project across and verified tests run.

* Nuget package support for reusable DLLs

* Use 1.1 version per Karl's suggestion

* Use correct license URL and project URL

* Use new SMO packages

src/Microsoft.SqlTools.DataProtocol.Contracts/Common/WorkspaceFolder.cs

@@ -0,0 +1,20 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.DataProtocol.Contracts.Common
+{
+    public class WorkspaceFolder
+    {
+        /// <summary>
+        /// Name of the workspace folder. Defaults to <see cref="Uri"/>'s basename
+        /// </summary>
+        public string Name { get; set; }
+        
+        /// <summary>
+        /// Associated URI for this workspace folder
+        /// </summary>
+        public string Uri { get; set; }
+    }
+}