Allow the queue worker to receive plain JSON messages from third parties.

[menpablo]

I was thinking that maybe it would be useful, at least it would have been for some of my projects, to make the queue worker able to receive messages on plain json. This would allow third party services to send messages to be processed by laravel.
This would be very helpful in systems that need to integrate with legacy systems asynchronously.

For example, I have a central inventory systems that receive inventory movements and other data from an old branch POS soft.
We just need to have a predefined contract. In our case we just used a field "MessageType" that should be match with some configuration on the queue.php file to map it to a job. Here is an example:

{
  "Message": {
    "MessageType": "process_order",
    "data": {
      "resource_id": "8888888",
      "user_id": "191583287",
      "attempts": 1
    },
    "Timestamp": "2024-07-01T21: 12: 58+00: 00"
  }
}

on queue.php it could be mapped with something like this:

'worker_map' => [
      'process_order' => App\Jobs\ProcessOrderJob::class
]

What do you think?