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/RequestBuilders/IBodyRequestBuilder.cs

@@ -1,13 +1,14 @@
 using JetBrains.Annotations;
 using System;
 using WireMock.Matchers;
+using WireMock.Matchers.Request;
 
 namespace WireMock.RequestBuilders
 {
     /// <summary>
     /// The BodyRequestBuilder interface.
     /// </summary>
-    public interface IBodyRequestBuilder
+    public interface IBodyRequestBuilder : IRequestMatcher
     {
         /// <summary>
         /// WithBody: IMatcher