### _Why are the changes needed?_
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1. If you add a feature, you can talk about the use case of it.
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For more detail, please go to https://github.com/apache/incubator-kyuubi/issues/981
`EngineStatusStore` helps to push events to listener bus
`EngineStatusStore` is a memory store that tracking the number of statements and sessions, it provides:
- stores all elements, and sorted by startTimestamp.
- cleanup the last elements when reach a certain threshold.
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1023 from timothy65535/ky-1022.
Closes#1022
b9f355c4 [timothy65535] [KYUUBI #1022] Add basic EngineStatusStore for events
Authored-by: timothy65535 <timothy65535@163.com>
Signed-off-by: Kent Yao <yao@apache.org>
22e6432e4d