Add refactored nsi common service handler

Hcs.Client/Client/Api/Request/NsiCommon/ExportNsiItemRequest.cs

@@ -0,0 +1,30 @@
+using Hcs.Client.Internal;
+using Hcs.Service.Async.NsiCommon;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Hcs.Client.Api.Request.NsiCommon
+{
+    internal class ExportNsiItemRequest(ClientBase client) : NsiCommonRequestBase(client)
+    {
+        internal async Task<NsiItemType> ExecuteAsync(int registryNumber, ListGroup listGroup, CancellationToken token)
+        {
+            // http://open-gkh.ru/NsiCommon/exportNsiItemRequest.html
+            var request = new exportNsiItemRequest
+            {
+                Id = Constants.SIGNED_XML_ELEMENT_ID,
+                version = "10.0.1.2",
+                RegistryNumber = registryNumber.ToString(),
+                ListGroup = listGroup
+            };
+
+            var result = await SendAndWaitResultAsync(request, async (asyncClient) =>
+            {
+                var response = await asyncClient.exportNsiItemAsync(CreateRequestHeader(), request);
+                return response.AckRequest.Ack;
+            }, token);
+
+            return result.Item as NsiItemType;
+        }
+    }
+}