public void setConsumer(RocketMQConsumerProperties consumer) {
		this.consumer = consumer;
	}
@return {@link RocketMQConsumerProperties} Consumer specific binding
properties. @see {@link RocketMQConsumerProperties}.
spring-cloud-alibaba-starters/spring-cloud-starter-stream-rocketmq/src/main/java/com/alibaba/cloud/stream/binder/rocketmq/properties/RocketMQSpecificPropertiesProvider.java