[Feature] Consider add ExtensibleScheduledThreadPool

[songjinze]

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Feature Request

Hi, i am a new user for hippo4j. When i read the source code and i found plugin just support ThreadPoolExecutor class(ExtensibleThreadPool). But in my company most business code use ScheduledThreadPoolExecutor which is a subclass of ThreadPoolExecutor. So i think maybe hippo4j can support ScheduledThreadPoolExecutor so that i can monitor this type of thread pool.

您好，我是hippo4j新手。我读源码的时候发现底层plugin实现仅仅支持ThreadPoolExecutor。但是在我公司的业务代码中使用了许多ScheduledThreadPoolExecutor，也就是ThreadPoolExecutor的子类。所以我想hippo4j也许可以支持定时任务线程池，这样我就可以监控这类线程池任务了。

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• Yes I am willing to submit a PR!

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