feat: Add Protobuf protocol support for structured binary file parsing

[TinyZzh]

• Implement ProtobufStructHandler for parsing .protobuf files
• Add protobuf dependency (com.google.protobuf:protobuf-java:4.29.2)
• Register handler in SPI configuration
• Add FILE_PROTOBUF extension constant to FileExtensionMatcher
• Update module-info.java with protobuf module requirement
• Generate PersonProto test class for descriptor testing
• Add comprehensive test suite with 33 test cases
• Achieve 100% instruction and branch coverage

Features:

• Support for startOrder and endOrder configuration
• Dynamic message parsing using protobuf descriptors
• Handle empty messages and parse errors gracefully
• Convert protobuf messages to StructImpl with proper field mapping
• Support for repeated fields (comma-separated values)

[codecov]

Codecov Report

❌ Patch coverage is 95.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.35%. Comparing base (a42aa92) to head (7b9e90c).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...org/struct/core/handler/ProtobufStructHandler.java	95.55%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #14      +/-   ##
============================================
+ Coverage     84.83%   85.35%   +0.52%     
- Complexity      782      809      +27     
============================================
  Files            65       66       +1     
  Lines          2327     2417      +90     
  Branches        394      412      +18     
============================================
+ Hits           1974     2063      +89     
- Misses          181      185       +4     
+ Partials        172      169       -3     

Flag	Coverage Δ
unittests	85.35% <95.55%> (+0.52%)	⬆️

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