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### _Why are the changes needed?_
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Add time metric on each` KyuubiBackendService` method can help us inspect Kyuubi Server running status inside. It can Indirect reflecting our RPC call time when using Kyuubi.
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [x] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1588 from zhenjiaguo/add_be_method_metric.
Closes#1586
a001eb96 [zhenjiaguo] Add time metric on each KyuubiBackendService method
Authored-by: zhenjiaguo <zhenjia_guo@163.com>
Signed-off-by: Kent Yao <yao@apache.org>
f3dc1fdecd
