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/Scripting/Contracts/ScriptingSelectRequest.cs

@@ -0,0 +1,54 @@
+//
+// 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.Metadata.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.Scripting.Contracts
+{
+    /// <summary>
+    /// The type of scripting operation requested
+    /// </summary>
+    public enum ScriptOperation
+    {
+        Select = 0,
+        Create = 1,
+        Insert = 2,
+        Update = 3,
+        Delete = 4
+    }
+
+    /// <summary>
+    /// Script as request parameter type
+    /// </summary>
+    public class ScriptingScriptAsParams 
+    {
+        public string OwnerUri { get; set; }
+
+        public ScriptOperation Operation { get; set; }
+
+        public ObjectMetadata Metadata { get; set; }
+    }
+
+    /// <summary>
+    /// Script as request result type
+    /// </summary>
+    public class ScriptingScriptAsResult
+    {
+        public string OwnerUri { get; set; }
+
+        public string Script { get; set; }
+    }
+
+    /// <summary>
+    /// Script as request message type
+    /// </summary>
+    public class ScriptingScriptAsRequest
+    {
+        public static readonly
+            RequestType<ScriptingScriptAsParams, ScriptingScriptAsResult> Type =
+                RequestType<ScriptingScriptAsParams, ScriptingScriptAsResult>.Create("scripting/scriptas");
+    }
+}