Why did you create another DefaultMQProducer class in MQClientInstance class?

[chenchencc]

hi,
i am very interest in RocketMQ,so i decided to learn it's code,but i found the DefaultMQProducer class also created in MQClientInstance class,i don't understant(i just learn it ),thank you!

[chenchencc]

[zhouxinyu]

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