Initial metadata and scripting services (#280)

* Initial metadata service and scripting service files

* Simple metadata lookup with SMO objects

* Add metadata type class

* Remove SMO from metadata service.

* Cleanup metadata service SQL

* Initial MetadataService test

* Add scripting commands

* Add metadata test case

* Remove sleep used for testing

* Use random table name in metadata test

* Add scripting tests

src/Microsoft.SqlTools.ServiceLayer/Metadata/Contracts/MetadataListRequest.cs

@@ -0,0 +1,26 @@
+//
+// 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;
+
+namespace Microsoft.SqlTools.ServiceLayer.Metadata.Contracts
+{
+    public class MetadataQueryParams 
+    {
+        public string OwnerUri { get; set; }        
+    }
+
+    public class MetadataQueryResult
+    {
+        public ObjectMetadata[] Metadata { get; set; }
+    }
+
+    public class MetadataListRequest
+    {
+        public static readonly
+            RequestType<MetadataQueryParams, MetadataQueryResult> Type =
+                RequestType<MetadataQueryParams, MetadataQueryResult>.Create("metadata/list");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/Metadata/Contracts/ObjectMetadata.cs

@@ -0,0 +1,32 @@
+//
+// 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.ServiceLayer.Metadata.Contracts
+{
+    /// <summary>
+    /// Metadata type enumeration
+    /// </summary>
+    public enum MetadataType
+    {
+        Table = 0,
+        View = 1,
+        SProc = 2,
+        Function = 3
+    }
+
+    /// <summary>
+    /// Object metadata information
+    /// </summary>
+    public class ObjectMetadata 
+    {
+        public MetadataType MetadataType { get; set; }
+    
+        public string MetadataTypeName { get; set; }
+
+        public string Schema { get; set; }
+
+        public string Name { get; set; }
+    }
+}