[KYUUBI #3171] Expose mysql frontend connection metrics

[lightning-L]

Why are the changes needed?

Close #3171

How was this patch tested?

• [x] 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 locally before make a pull request

[codecov-commenter]

Codecov Report

Merging #3237 (9abcd39) into master (92f3a53) will decrease coverage by 0.28%. The diff coverage is 92.30%.

:exclamation: Current head 9abcd39 differs from pull request most recent head 2021752. Consider uploading reports for the commit 2021752 to get more accurate results

@@             Coverage Diff              @@
##             master    #3237      +/-   ##
============================================
- Coverage     51.23%   50.95%   -0.29%     
  Complexity       13       13              
============================================
  Files           468      470       +2     
  Lines         26145    26133      -12     
  Branches       3627     3611      -16     
============================================
- Hits          13396    13315      -81     
- Misses        11466    11546      +80     
+ Partials       1283     1272      -11     

Impacted Files	Coverage Δ
...server/mysql/authentication/MySQLAuthHandler.scala	72.72% <0.00%> (ø)
...a/org/apache/kyuubi/metrics/MetricsConstants.scala	100.00% <100.00%> (ø)
...che/kyuubi/server/KyuubiMySQLFrontendService.scala	90.62% <100.00%> (+0.14%)	:arrow_up:
...i/server/mysql/MySQLConnectionMetricsHandler.scala	100.00% <100.00%> (ø)
...mon/src/main/scala/org/apache/kyuubi/Logging.scala	43.42% <0.00%> (-1.32%)	:arrow_down:
...yuubi/server/metadata/jdbc/JDBCMetadataStore.scala	89.27% <0.00%> (-0.70%)	:arrow_down:
...ine/spark/operation/SparkSQLOperationManager.scala	83.33% <0.00%> (-0.28%)	:arrow_down:
...he/kyuubi/jdbc/hive/ZooKeeperHiveClientHelper.java	3.00% <0.00%> (-0.20%)	:arrow_down:
...rc/main/scala/org/apache/spark/ui/EnginePage.scala	78.86% <0.00%> (-0.07%)	:arrow_down:
.../java/org/apache/kyuubi/jdbc/KyuubiHiveDriver.java	4.87% <0.00%> (ø)
... and 15 more

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[github-actions[bot]]

Thanks for the PR! This PR is being closed due to inactivity. This isn't a judgement on the merit of the PR in any way. If this is still an issue with the latest version of Kyuubi, please reopen it and ask a committer to remove the Stale tag!

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