### _Why are the changes needed?_
Fix https://github.com/apache/incubator-kyuubi/issues/3414
Currently, Kyuubi supports output of planOnly in different modes in different styles, As more and more modes and styles are supported, defining enumerations in kyuubiConf is a bit messy and not easy to extend, so this pr aims to tidy up these
### _How was this patch tested?_
- [ ] 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.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#3415 from Yikf/tidy-up.
Closes#3414
e81142e5 [yikf] Tidy up plan only related modes and styles
Authored-by: yikf <yikaifei1@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>
331f1a3bdf