Add refactored nsi common service handler

Hcs.TestApp/TestApp/Scenario/NsiCommonScenario.cs

@@ -0,0 +1,17 @@
+using Hcs.Client;
+using Hcs.Service.Async.NsiCommon;
+using System;
+
+namespace Hcs.TestApp.Scenario
+{
+    internal class NsiCommonScenario(UniClient client)
+    {
+        private readonly UniClient client = client;
+
+        internal void ExportNsiItem2()
+        {
+            var result = client.NsiCommon.ExportNsiItem(2, ListGroup.NSI).Result;
+            Console.WriteLine("Scenario execution " + (result != null ? "succeeded" : "failed"));
+        }
+    }
+}