Added a helper for checking for session heartbeats.

Author: niemyjski

Source/Shared/Extensions/EventExtensions.cs

@@ -94,6 +94,13 @@ public static bool IsFeatureUsage(this Event ev) {
             return ev.Type == Event.KnownTypes.FeatureUsage;
         }
 
+        /// <summary>
+        /// Returns true if the event type is session heartbeat.
+        /// </summary>
+        public static bool IsSessionHeartbeat(this Event ev) {
+            return ev.Type == Event.KnownTypes.SessionHeartbeat;
+        }
+
         /// <summary>
         /// Returns true if the event type is session start.
         /// </summary>