Add support for Faults (#360)

* FaultType - wip

* .

* copy fault

* tests

* code-factor

* more tests

* fix tests

* fixed

* remove RANDOM_DATA_THEN_CLOSE

src/WireMock.Net/Server/FluentMockServer.Admin.cs

@@ -820,6 +820,11 @@ namespace WireMock.Server
                 responseBuilder = responseBuilder.WithBodyFromFile(responseModel.BodyAsFile);
             }
 
+            if (responseModel.Fault != null && Enum.TryParse(responseModel.Fault.Type, out FaultType faultType))
+            {
+                responseBuilder.WithFault(faultType, responseModel.Fault.Percentage);
+            }
+
             return responseBuilder;
         }