Add 'Data' to response which can be used during transforming the response (#893)

* Add 'Data' to response which can be used during transforming the response

* md

* hb

* fix

* Linq

* fix test

* v4

* 14

* .

* x

* remove

* s

src/WireMock.Net/Transformers/TransformModel.cs

@@ -10,4 +10,6 @@ internal struct TransformModel
     public IRequestMessage request { get; set; }
 
     public IResponseMessage? response { get; set; }
+
+    public object data { get; set; }
 }

src/WireMock.Net/Transformers/Transformer.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Stef.Validation;
+using WireMock.ResponseBuilders;
 using WireMock.Settings;
 using WireMock.Types;
 using WireMock.Util;
@@ -115,7 +116,8 @@ internal class Transformer : ITransformer
         {
             mapping = mapping,
             request = request,
-            response = response
+            response = response,
+            data = mapping.Data ?? new { }
         });
     }