SP-17454 update c# client and avoid extra serialization

Author: KirylKovaliov

src/Regula.DocumentReader.WebClient/Model/StatusResult.cs

@@ -9,12 +9,18 @@
  */
 
 using System;
+using System.Linq;
 using System.IO;
 using System.Text;
+using System.Text.RegularExpressions;
+using System.Collections;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Runtime.Serialization;
 using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
 using System.ComponentModel.DataAnnotations;
+using OpenAPIDateConverter = Regula.DocumentReader.WebClient.Client.OpenAPIDateConverter;
 
 namespace Regula.DocumentReader.WebClient.Model
 {