Fix recorded requests skipped by request logger (#346)

* Fix recorded requests skipped request logger.
- When proxy is enabled the recorded requests are mistaken (IMO) for admin requests and skipped

* Add unit test

* Use different solution

* Introduce IsRecordedByProxy property on Mapping class

* Cleanup empty lines

* Refactored fix suggested way

src/WireMock.Net/Mapping.cs

@@ -48,6 +48,9 @@ namespace WireMock
         /// <inheritdoc cref="IMapping.IsAdminInterface" />
         public bool IsAdminInterface => Provider is DynamicResponseProvider || Provider is DynamicAsyncResponseProvider || Provider is ProxyAsyncResponseProvider;
 
+        /// <inheritdoc cref="IMapping.LogMapping" />
+        public bool LogMapping => !(Provider is DynamicResponseProvider || Provider is DynamicAsyncResponseProvider);
+
         /// <summary>
         /// Initializes a new instance of the <see cref="Mapping"/> class.
         /// </summary>