Kafka Queue Handler

[coreation]

Notes

Hello everyone, this PR isn't meant to be PR'ed right away (cfr. composer changes isn't something I want to merge back into the stack), it's a PoC for the use case where I want to listen to a Kafka topic that isn't a serialised PHP class. When configuring Kafka, the laravel container tries to create a job out of the job payload, but for topics that are just transferring data, this of course goes wrong.

My idea was to have a configuration for a "handler" class to handle this use case. I noticed in the Symfony documentation example there was a spot for a "client", but I don't see anything else wrt to how this interacts exactly with the framework. Assuming this "client" configuration entry serves the same purpose as this "handler" configuration, I'd be interested to see how I could configure it inside the queue.php config file.