moveToDeadLetter method
Permanently removes a message from the _queue and sends it to dead letter _queue. Important: This method is not supported by RabbitMQ. Parameters:
message
a message to be removed. Return Future that recive a null when all done Throws error
Implementation
@override
Future moveToDeadLetter(MessageEnvelope message) async {
_checkOpened('');
// Operation is not supported
}