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### _Why are the changes needed?_
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Change the config keys of metrics to get a consistent name style, `metrics.{reporter_type}.{property}`.
The change breaks the compatibility with master, but consider v1.2.0 is not out yet, so changes should be safe.
### _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/tools/testing.html#running-tests) locally before make a pull request
Closes#601 from pan3793/metrics.
Closes#601
89d1974f [Cheng Pan] address comments
361ae6e2 [Cheng Pan] revert default metrics reporter change
1c493e64 [Cheng Pan] rat exclude report.json
fcdb4252 [Cheng Pan] exclude report.json
337e09ae [Cheng Pan] Default enable SFL4J metrics reporter
6b9f3963 [Cheng Pan] [METRICS] Change metrics config keys
Authored-by: Cheng Pan <379377944@qq.com>
Signed-off-by: Cheng Pan <379377944@qq.com>
09c5f9123e