feat(JsonExtensions): create to be able to make fluent Json serilization

EnvelopeGenerator.Web/Controllers/DocumentController.cs

@@ -1,4 +1,5 @@
 using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Extensions;
 using EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
 using EnvelopeGenerator.Domain.Constants;
 using MediatR;
@@ -33,7 +34,7 @@ public class DocumentController : ControllerBase
         if(byteData is null || byteData.Length == 0)
         {
             _logger.LogError("Document byte data is null or empty for envelope-receiver entity:\n{envelopeKey}.",
-                JsonConvert.SerializeObject(envRcv, Format.Json.ForDiagnostics));
+                envRcv.ToJson(Format.Json.ForDiagnostics));
             throw new NotFoundException("Document is empty.");
         }