refactor: parse protos

[Kybxd]

• compiler: use filepath.Rel to make the path of protoFiles relative to protoPaths.
• protogen: ProtoInputOption.ProtoFiles accepts glob patterns relative to current working directory (consistent with confgen).
• protogen/confgen: all imports must be explicitly specified by InputOption.ProtoFiles, which guarantees predefined files not to import generated files.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.13%. Comparing base (2fe0c0a) to head (8e7bf97).

Files with missing lines	Patch %	Lines
internal/x/xproto/protoc/compiler.go	86.36%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #343      +/-   ##
==========================================
- Coverage   75.14%   75.13%   -0.01%     
==========================================
  Files          85       85              
  Lines        8570     8579       +9     
==========================================
+ Hits         6440     6446       +6     
- Misses       1564     1566       +2     
- Partials      566      567       +1     

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