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[KYUUBI apache#634] Move kyuubi extension to its own dir when building

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### _Why are the changes needed?_
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Make Kyuubi jars clear.

### _How was this patch tested?_
Manual test.  After this PR, the packaged dir looks like:
![image](https://user-images.githubusercontent.com/12025282/118102872-e3895400-b40b-11eb-994c-26d28b45e9a8.png)

Closes apache#634 from ulysses-you/extension-dir.

Closes apache#634

2c5009a [ulysses-you] comment
35063ea [ulysses-you] Merge branch 'master' of https://github.com/NetEase/kyuubi into extension-dir
f2b4fff [ulysses-you] init

Authored-by: ulysses-you <[email protected]>
Signed-off-by: Kent Yao <[email protected]>
(cherry picked from commit 7f040fb)
Signed-off-by: Kent Yao <[email protected]>

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