Draft: [AMORO-4034][Improvement]: MaintainerMetrics Unified interface and Report

[czy006]

[Improvement]: MaintainerMetrics Unified interface and Report (#4034)

Why are the changes needed?

Close #4034 .

Brief change log

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 locally before making a pull request

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 26.76768% with 145 lines in your changes missing coverage. Please review.
✅ Project coverage is 22.53%. Comparing base (cbdc517) to head (3eb329e).
⚠️ Report is 34 commits behind head on master.

Files with missing lines	Patch %	Lines
...ats/iceberg/maintainer/IcebergTableMaintainer.java	11.53%	136 Missing and 2 partials ⚠️
...org/apache/amoro/maintainer/MaintainerMetrics.java	25.00%	6 Missing ⚠️
...ache/amoro/maintainer/MaintainerOperationType.java	90.90%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4045      +/-   ##
============================================
+ Coverage     22.12%   22.53%   +0.40%     
- Complexity     2461     2570     +109     
============================================
  Files           445      459      +14     
  Lines         40897    42239    +1342     
  Branches       5767     5924     +157     
============================================
+ Hits           9050     9520     +470     
- Misses        31089    31902     +813     
- Partials        758      817      +59     

Flag	Coverage Δ
trino	22.53% <26.76%> (+0.40%)	⬆️

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