adding a new event for when definition is requested (#167)

* sending telemetry events for intellisense usage

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/Completion/AutoCompletionResult.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 System.Collections.Generic;
+using System.Diagnostics;
+using Microsoft.SqlServer.Management.SqlParser.Intellisense;
+using Microsoft.SqlTools.ServiceLayer.LanguageServices.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.LanguageServices.Completion
+{
+    /// <summary>
+    /// Includes the objects created by auto completion service
+    /// </summary>
+    public class AutoCompletionResult
+    {
+        /// <summary>
+        /// Creates new instance
+        /// </summary>
+        public AutoCompletionResult()
+        {
+            Stopwatch = new Stopwatch();
+            Stopwatch.Start();
+        }
+
+        private Stopwatch Stopwatch { get; set; }
+
+        /// <summary>
+        /// Completes the results to calculate the duration
+        /// </summary>
+        public void CompleteResult(CompletionItem[] completionItems)
+        {
+            Stopwatch.Stop();
+            CompletionItems = completionItems;
+        }
+
+        /// <summary>
+        /// The number of milliseconds to process the result
+        /// </summary>
+        public double Duration
+        {
+            get
+            {
+                return Stopwatch.ElapsedMilliseconds;
+            }
+        }
+        
+        /// <summary>
+        /// Completion list
+        /// </summary>
+        public CompletionItem[] CompletionItems { get; private set; }
+    }
+}