Get Database Info (#370)

* added get database info to admin service

* refactored code to be inline with standard

* added comments to utils functions

* added comments to public classes

* removed camelcase from request type

* removed the wrapper for the generic dictionary

* removed unnecessary imports

src/Microsoft.SqlTools.ServiceLayer/Admin/Contracts/GetDatabaseInfoRequest.cs

@@ -0,0 +1,41 @@
+//
+// 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.Admin.Contracts
+{
+    /// <summary>
+    /// Params for a get database info request
+    /// </summar>
+    public class GetDatabaseInfoParams
+    {
+        /// <summary>
+        /// Uri identifier for the connection to get the database info for
+        /// </summary>
+        public string OwnerUri { get; set; }
+    }
+
+    /// <summary>
+    /// Response object for get database info
+    /// </summary>
+    public class GetDatabaseInfoResponse
+    {
+        /// <summary>
+        /// The object containing the database info
+        /// </summary>
+        public DatabaseInfo Result { get; set; }
+    }
+
+    /// <summary>
+    /// Get database info request mapping
+    /// </summary>
+    public class GetDatabaseInfoRequest
+    {
+        public static readonly
+            RequestType<GetDatabaseInfoParams, GetDatabaseInfoResponse> Type =
+                RequestType<GetDatabaseInfoParams, GetDatabaseInfoResponse>.Create("admin/getdatabaseinfo");
+    }
+}