[HttpKernel] make it configurable which status codes should be logged

ExceptionListener::logException currently logs every exception. In some cases one might for example not log 404 errors at all. Currently one needs to either override the parameter defining the class name of the service or overriding the twig bundle service itself.

It might be useful to have some way to filter (regexp?, blacklist?, whitelist?) which status codes should be logged. For example ignore all 404.