Please add a retry interval for failed jobs

[mlambley]

Right now when I have a job that fails (throws an Exception) and is requeued, the system immediately attempts to run it $maxRetries times and then fails altogether.

In the case where the error is caused by a network issue or a third-party system being down, waiting an amount of time before trying again would be beneficial.

I suggest implementing a field in mq-mysql\Api\Data\QueueMessageInterface named something like run_task_at. That way tasks can be scheduled to run in the future. And then have a retry interval, perhaps a number of seconds, configurable in StartConsumerCommand (and preferably the ceQueue xml as well - see #16).

I haven't looked into your mq-amqp module but I imagine that a similar thing could be implemented there too.

Thank you.