Allow messages to return an error from destination

[mpetrun5]

We currently retry indexing if a event handler fails to do an action, but we don't have that ability when a message goes to the destination. We want to be able to restart from that block even if something on the destination fails.

Implementation details

Add an error channel to the message (buffered) that can written from the destination if an event handler needs to return an error in case of destination error

Testing details

• unit tests

Acceptance Criteria

• we are able to retry destination errors