feat(Format): create to centrilize the formats.

- Add json serializer settings for diagnostics and implement to DocumentController

EnvelopeGenerator.Domain/Constants/Format.cs

@@ -0,0 +1,20 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace EnvelopeGenerator.Domain.Constants
+{
+    public class Format
+    {
+        #region Json Serializer Settings
+        public static class Json
+        {
+            public static readonly JsonSerializerSettings ForDiagnostics = new JsonSerializerSettings()
+            {
+                ContractResolver = new CamelCasePropertyNamesContractResolver(),
+                Formatting = Formatting.Indented,
+                NullValueHandling = NullValueHandling.Include
+            };
+        }
+        #endregion
+    }
+}

EnvelopeGenerator.Domain/EnvelopeGenerator.Domain.csproj

@@ -35,6 +35,7 @@
 
   <ItemGroup>
     <PackageReference Include="DigitalData.EmailProfilerDispatcher.Abstraction.Attributes" Version="1.0.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="UserManager.Domain" Version="3.2.3" />
   </ItemGroup>