Added service for model management for machine learning extension (#1138)

* Added service for model management for ml extension

src/Microsoft.SqlTools.ServiceLayer/ModelManagement/Contracts/ModelMetadata.cs

@@ -0,0 +1,75 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+
+namespace Microsoft.SqlTools.ServiceLayer.ModelManagement
+{
+    /// <summary>
+    /// Model metadata
+    /// </summary>
+    public class ModelMetadata
+    {
+        /// <summary>
+        /// Model id
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// Model content length
+        /// </summary>
+        public Int64 ContentLength { get; set; }
+
+        /// <summary>
+        /// Model name
+        /// </summary>
+        public string ModelName { get; set; }
+
+        /// <summary>
+        /// Model created date
+        /// </summary>
+        public string Created { get; set; }
+
+        /// <summary>
+        /// Model deployment time
+        /// </summary>
+        public string DeploymentTime { get; set; }
+
+        /// <summary>
+        /// Model version
+        /// </summary>
+        public string Version { get; set; }
+
+        /// <summary>
+        /// Model description
+        /// </summary>
+        public string Description { get; set; }
+
+        /// <summary>
+        /// Model file path
+        /// </summary>
+        public string FilePath { get; set; }
+
+        /// <summary>
+        /// Model framework
+        /// </summary>
+        public string Framework { get; set; }
+
+        /// <summary>
+        /// Model framework version
+        /// </summary>
+        public string FrameworkVersion { get; set; }
+
+        /// <summary>
+        /// Model run id
+        /// </summary>
+        public string RunId { get; set; }
+
+        /// <summary>
+        /// Model deploy by
+        /// </summary>
+        public string DeployedBy { get; set; }
+    }
+}