### _Why are the changes needed?_
To close#4615
- bump Ranger version to 2.4.0, release notes: https://cwiki.apache.org/confluence/display/RANGER/Apache+Ranger+2.4.0+-+Release+Notes
- #4585 fixed duplication and conflict in policy file
- update docs
### _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
- [x] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#4675 from bowenliang123/ranger-2.4.0.
Closes#4615
d403bc324 [liangbowen] bump ranger from 2.3.0 to 2.4.0
Authored-by: liangbowen <liangbowen@gf.com.cn>
Signed-off-by: liangbowen <liangbowen@gf.com.cn>
d7532c5fd5