Implement heartbeat

[akloboucnik]

My take on #95.

I based the impementation on https://docs.google.com/presentation/d/1Hlv4qaWm2PRU04dVPmShP9wU7TEQEttXdsbV8P54Uvw/edit#slide=id.ge4c0ef0fc0_0_2 and https://www.rabbitmq.com/heartbeats.html#heartbeats-interval

TODO

• disabling heartbeat (https://www.rabbitmq.com/heartbeats.html#disabling)
• test

[michaelklishin]

@akloboucnik from our experience with heartbeat implementations in other clients (not just RabbitMQ Stream Protocol ones), it is notoriously difficult to integration test. I'd be happy to test this PR, perhaps do a bit of renaming and try to get it over the line.

Would that be OK with you?

[wolf4ood]

@michaelklishin

this was stalled and basically the worked has been finished here

#163

Let in case let me know if you have time to test it :)

[michaelklishin]

@wolf4ood ah, I see. So this should be closed then.

[Gsantomaggio]

@wolf4ood we can close this, right?

[akloboucnik]

@michaelklishin Sorry, I had to move on working on more pressing things at work and never got back to this :-(

@wolf4ood Thank you for implementing this!