CanalRocketMQProducer 通过ExecutorTemplate并发执行，线程池出现一直等待现象

[zbjice]

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environment

• canal version
  v1.1.5-alpha-1
• mysql version
  5.7

Issue Description

CanalRocketMQProducer 通过ExecutorTemplate并发执行时，由于提交到线程池里的分表任务、buildMessageData任务、分区发送任务有先后依赖，会出现worker线程相互依赖导致woker线程及主线程都分表任务占用，又一直等待buildMessageData任务、分区发送任务执行，出现一直等待现象

Steps to reproduce

Expected behaviour

线程池里的worker任务不应该产生依赖

Actual behaviour

If there is an exception, please attach the exception trace:

Just put your stack trace here!