protogen(BREAKING!): support protobuf editions and properly quote file option values

[Kybxd]

• close protogen(Protobuf-Editions): support Protobuf Edition 2023 and 2024 #369

Summary

This MR adds support for Protobuf Editions in proto file generation, and changes how file-level option values are specified to give users full control over quoting.

Changes

Support protobuf edition

• Added Edition field to ProtoOutputOption, allowing users to specify a protobuf edition (e.g., "2023", "2024").
• When Edition is set, the generated .proto files emit edition = "20XX"; instead of syntax = "proto3";.
• This enables the use of edition-specific features such as features.utf8_validation (edition 2023) and features.(pb.go).strip_enum_prefix (edition 2024).

File option value quoting change (BREAKING CHANGE)

• File option values are now written as-is to the generated proto file (i.e., option <key= <value>;).
• Users must explicitly include quotes in the value when needed. For example, go_package should now be specified as '"github.com/example/pkg"' instead of github.com/example/pkg.
• This change is necessary to support edition features options (e.g., features.utf8_validation = NONE) which require unquoted enum values.

Tests

• Added Test_bookExporter_export with table-driven test cases covering:
  • Default proto3 syntax mode
  • edition = "2023" with features.utf8_validation
  • edition = "2024" with features.(pb.go).strip_enum_prefix
• Each test verifies the generated proto file contains the correct edition/syntax declaration and properly formatted options.

Migration Guide

Existing users must update their fileOptions configuration to include explicit quotes around string option values. For example:

# Before
fileOptions:
  go_package: github.com/example/protoconf

# After
fileOptions:
  go_package: '"github.com/example/protoconf"'

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.93%. Comparing base (bc70718) to head (cccbb1c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #370      +/-   ##
==========================================
+ Coverage   73.91%   73.93%   +0.01%     
==========================================
  Files          87       87              
  Lines        8664     8670       +6     
==========================================
+ Hits         6404     6410       +6     
  Misses       1700     1700              
  Partials      560      560              

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[wenchy]

LGTM