dubbo-go Feature/metadata service tri export clean

feat: format imports and finalize MetadataServiceV2 implementation

Format import statements using imports-formatter with three distinct blocks
Ensure proper separation of standard library, third-party, and internal packages
Finalize MetadataServiceV2 implementation for Java 3.3.1 compatibility
Add comprehensive unit tests for MetadataServiceV2 functionality
Implement dual protocol architecture supporting both V1 and V2 versions

Aug 24 '25 06:08 wqyenjoy

Codecov Report

:x: Patch coverage is 61.40351% with 22 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 39.52%. Comparing base (97a472c) to head (d239049).

Files with missing lines	Patch %	Lines
metadata/metadata_service.go	61.40%	19 Missing and 3 partials :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2983      +/-   ##
===========================================
+ Coverage    39.36%   39.52%   +0.16%     
===========================================
  Files          457      457              
  Lines        38863    38891      +28     
===========================================
+ Hits         15299    15373      +74     
+ Misses       22304    22254      -50     
- Partials      1260     1264       +4

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