Enrich generated code with status code (#927)

src/WireMock.Net/Serialization/MappingConverter.cs

@@ -125,6 +125,11 @@ internal class MappingConverter
         // Response
         sb.AppendLine("    .RespondWith(Response.Create()");
 
+        if (response.ResponseMessage.StatusCode is { } statusCode)
+        {
+            sb.AppendLine($"        .WithStatusCode({statusCode})");
+        }
+
         if (response.ResponseMessage.Headers is { })
         {
             foreach (var header in response.ResponseMessage.Headers)

test/WireMock.Net.Tests/WireMockAdminApiTests.IWireMockAdminApi_GetMappingCodeByGuidAsync.verified.txt

@@ -7,5 +7,6 @@ server
     )
     .WithGuid("90356dba-b36c-469a-a17e-669cd84f1f05")
     .RespondWith(Response.Create()
+        .WithStatusCode(200)
         .WithBody("1")
     );

test/WireMock.Net.Tests/WireMockAdminApiTests.IWireMockAdminApi_GetMappingsCode.verified.txt

@@ -7,6 +7,7 @@ server
     )
     .WithGuid("90356dba-b36c-469a-a17e-669cd84f1f05")
     .RespondWith(Response.Create()
+        .WithStatusCode(200)
         .WithBody("1")
     );
 
@@ -18,6 +19,7 @@ server
     )
     .WithGuid("1b731398-4a5b-457f-a6e3-d65e541c428f")
     .RespondWith(Response.Create()
+        .WithStatusCode(201)
         .WithHeader("hk", "hv")
         .WithBody("2")
     );