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

EnvelopeGenerator.Domain/Constants/Format.cs

@@ -1,6 +1,4 @@
-using Newtonsoft.Json;
-using Newtonsoft.Json.Serialization;
-#if NET
+#if NET
 using System.Text.Json;
 using System.Text.Json.Serialization;
 #endif
@@ -12,15 +10,14 @@ namespace EnvelopeGenerator.Domain.Constants
         #region Json Serializer Settings
         public static class Json
         {
-            //TODO: update to use System.Text.Json
-            public static readonly JsonSerializerSettings ForDiagnostics = new JsonSerializerSettings()
+#if NET
+            public static readonly JsonSerializerOptions ForDiagnostics = new()
             {
-                ContractResolver = new CamelCasePropertyNamesContractResolver(),
-                Formatting = Formatting.Indented,
-                NullValueHandling = NullValueHandling.Include
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+                WriteIndented = true,
+                DefaultIgnoreCondition = JsonIgnoreCondition.Never
             };
 
-#if NET
             public static readonly JsonSerializerOptions ForAnnotations = new()
             {
                 PropertyNamingPolicy = JsonNamingPolicy.CamelCase,