Look into serializing messages for HandleConsumer

[driesvints]

Message objects in HandleConsumer are at the moment just serialized onto the queued which hard-binds them. It would be good if this job used MessageSerializer like in the repository:

https://github.com/EventSaucePHP/LaravelEventSauce/blob/7bd64ed9fea550d2fb1912b561710c7dbc2b72e1/src/LaravelMessageRepository.php#L42