⚡ Add acknowledge option for RabbitMQ

[tinti]

Add the option to acknowledge or not acknowledge messages coming from
trigger node.

The current implementation reuses sendResponse logic from node
RespondToWebhook.

[CLAassistant]

All committers have signed the CLA.

[tinti]

Hi @michael-radency, @nivb06, @Joffcom,

This PR references: #2646

My goal with this implementation is to allow one to control if a message will be acknowledged and removed from the queue or if it will be not acknowledged and put back to the queue. This can be reused in other message queue systems in the future.

Example:

Trigger -> if (Math.round(Math.random()) == 1) -> Ack
           else                                -> Nack

I am still not very confident with this solution. It does not work with manualTriggerFunction because the channel is closed before the message is acked. RabbitMQ requires a message to be acked or nacked at the same channel that it was pulled. At least it works fine with background processes.

Do you have any suggestions?

[janober]

Thanks a lot for your contribution but I am closing this PR as the same logic got in the meantime already implemented but a little bit different to not require an additional response node. If we want to add it via a special node in the future we can use this PR.