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Stops the given consumer from consuming.

This method cancels a consumer. This does not affect already delivered messages, but it does
mean the server will not send any more messages for that consumer. The client may receive an
arbitrary number of messages in between sending the cancel method and receiving the reply.

`consumer_tag` identifies the "subscription" to cancel, that is, the subscription of a
consumer to a specific queue. The consumer tag is returned by `consume/4`.

## Options

  * `:no_wait` - If set, the cancel operation is asynchronous. Defaults to
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