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### _Why are the changes needed?_
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Make full use of KyuubiRestFrontendService without hacking, e.g. for the swagger UI base.
We can do further improvement based on this PR.
### _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.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1639 from yaooqinn/ApiRequestContext.
Closes#1639
3c0c7061 [Kent Yao] Make ApiRequestContext provides KyuubiRestFrontendService directly
10506c2c [Kent Yao] Make ApiRequestContext provides KyuubiRestFrontendService directly
1482bd78 [Kent Yao] Make ApiRequestContext provides KyuubiRestFrontendService directly
01a0b023 [Kent Yao] Make ApiRequestContext provides KyuubiRestFrontendService directly
d3119fa4 [Kent Yao] Make ApiRequestContext provides KyuubiRestFrontendService directly
0f45258c [Kent Yao] Make ApiRequestContext provides KyuubiRestFrontendService directly
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>
c4fd287c8b