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/Server/RespondWithAProvider.cs

@@ -2,6 +2,7 @@
 // For more details see 'mock4net/LICENSE.txt' and 'mock4net/readme.md' in this project root.
 using System;
 using System.Collections.Generic;
+using JetBrains.Annotations;
 using Stef.Validation;
 using WireMock.Matchers.Request;
 using WireMock.Models;
@@ -39,6 +40,8 @@ internal class RespondWithAProvider : IRespondWithAProvider
 
     public ITimeSettings? TimeSettings { get; private set; }
 
+    public object? Data { get; private set; }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="RespondWithAProvider"/> class.
     /// </summary>
@@ -88,10 +91,20 @@ internal class RespondWithAProvider : IRespondWithAProvider
             _timesInSameState,
             Webhooks,
             _useWebhookFireAndForget,
-            TimeSettings);
+            TimeSettings,
+            Data);
+
         _registrationCallback(mapping, _saveToFile);
     }
 
+    /// <inheritdoc />
+    [PublicAPI]
+    public IRespondWithAProvider WithData(object data)
+    {
+        Data = data;
+        return this;
+    }
+
     /// <inheritdoc />
     public IRespondWithAProvider WithGuid(string guid)
     {