Add error callback per vhost connection

[ThisIsNSH]

Problem statement

• right now error callback is for entire rabbit context, for a multi vhost setup there is no possibility to provide separate error callback

Proposed changes

• add the possibility to add error callback per vhost when creating the connection. this error callback will take precedence over the one provided by in rabbit context. all now there is a possibility to stop getting error callback for a specific vhost by putting an empty callback during creation of connection

Remaining work

• Unit Tests
• Integration Tests
• Documentation