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### _Why are the changes needed?_
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closes https://github.com/apache/incubator-kyuubi/issues/988
### _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
- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#989 from ulysses-you/kyuubi-session-event.
Closes#988
baebf2eb [ulysses-you] address comment
283d574c [ulysses-you] fix
c5d1d5f7 [ulysses-you] adddress comment
44cfd06f [ulysses-you] docs
43639993 [ulysses-you] simplify session
2618b764 [ulysses-you] config name
a2d4608b [ulysses-you] docs
5adbe5c8 [ulysses-you] config
ea5c70e1 [ulysses-you] nit
eea73ed5 [ulysses-you] config
cda6d38b [ulysses-you] test
a754c76f [ulysses-you] init
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: ulysses-you <ulyssesyou18@gmail.com>
d49f8bf06d