Emit channel events

[tbence94]

Summary

• Emit channel events to avoid uncaught exceptions

Why do we need this?

This lib was built on the logic that each connection has a single channel. If that channel closes the connection becomes unusable and should either close or recreate the channel. If you call .checkQueue or assertQueue on the channel when the queue does not exist the channel will close. So other queues that were perfectly fine till this point will stop working.

By emitting close and error events developers can create custom error handling or reconnect logic to handle this issue.
Otherwise the exceptions thrown by check and assert calls would be uncaught because no one listens to them.