Cancel stops deliveries to the consumer chan established in Channel.Consume and identified by consumer.
Only use this method to cleanly stop receiving deliveries from the server and cleanly shut down the consumer chan identified by this tag. Using this method and waiting for remaining messages to flush from the consumer chan will ensure all messages received on the network will be delivered to the receiver of your consumer chan.
Continue consuming from the chan Delivery provided by Channel.Consume until the chan closes.
When noWait is true, do not wait for the server to acknowledge the cancel. Only use this when you are certain there are no deliveries requiring acknowledgment are in-flight otherwise they will arrive and be dropped in the client without an ack and will not be redelivered to other consumers.