feat(flink): Add metrics for RLI bootstrap operator

[cshuo]

Describe the issue this Pull Request addresses

Summary and Changelog

Impact

Risk Level

Documentation Update

Contributor's checklist

• Read through contributor's guide
• Enough context is provided in the sections above
• Adequate tests were added if applicable

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.25%. Comparing base (162cac2) to head (2a51f47).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18787      +/-   ##
============================================
+ Coverage     68.19%   68.25%   +0.05%     
- Complexity    29225    29318      +93     
============================================
  Files          2525     2528       +3     
  Lines        141660   141822     +162     
  Branches      17591    17624      +33     
============================================
+ Hits          96607    96794     +187     
+ Misses        37097    37060      -37     
- Partials       7956     7968      +12     

Flag	Coverage Δ
common-and-other-modules	44.42% <100.00%> (+0.07%)	⬆️
hadoop-mr-java-client	44.94% <ø> (-0.05%)	⬇️
spark-client-hadoop-common	48.26% <ø> (-0.04%)	⬇️
spark-java-tests	48.87% <ø> (+0.05%)	⬆️
spark-scala-tests	44.95% <ø> (+<0.01%)	⬆️
utilities	37.48% <ø> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
.../apache/hudi/metrics/FlinkRLIBootstrapMetrics.java	100.00% <100.00%> (ø)
...ache/hudi/sink/bootstrap/RLIBootstrapOperator.java	92.98% <100.00%> (+0.38%)	⬆️

... and 25 files with indirect coverage changes

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[hudi-bot]

CI report:

• 2a51f47 Azure: SUCCESS

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