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### _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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As disused in https://github.com/apache/incubator-kyuubi/discussions/1824.

Below is a preview of the new issue template.

<img width="1022" alt="截屏2022-01-28 23 06 12" src="https://user-images.githubusercontent.com/13482005/151570749-4b2679f5-dd9c-4ebc-96d6-0b9e2cc937ed.png">

### _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 #1846 from link3280/improvement/new-issue-template.

Closes #1846

65c944fd [Paul Lin] Add checkboxes sections
05584f27 [Paul Lin] Add `improvement` issue template
Authored-by: Paul Lin <paullin3280@gmail.com>
Signed-off-by: Fei Wang <fwang12@ebay.com>