Add support for protobuf editions

[pseudomuto]

• Add edition detection methods: GetEdition(), IsEditions(), GetEditionName()
• Add GetEditionComments() for accessing edition directive comments
• Add feature detection methods: HasExplicitFieldPresence(), GetSyntaxType()
• Enhance IsProto3() methods to maintain backward compatibility
• Add edition comment extraction in parser (field path 14)
• Create test fixtures for edition 2023 and 2024 syntax
• Add test coverage for editions parsing, services, enums, and messages
• Update descriptor set generation to include edition files
• Fix utils tests to account for additional proto files
• Reorganize types.go to follow code structure conventions

[Copilot]

Pull Request Overview

This PR adds comprehensive support for protobuf editions syntax (2023 and 2024) to the protokit library. The implementation maintains backward compatibility with existing proto2/proto3 detection while introducing new APIs for editions-specific features like explicit field presence and edition identification.

Key Changes:

• Introduces edition detection and feature methods (GetEdition, IsEditions, HasExplicitFieldPresence, GetSyntaxType)
• Adds EditionComments field for accessing edition directive comments
• Includes test fixtures for edition 2023 and 2024 with comprehensive test coverage

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
types.go	Adds edition-related methods and fields, reorganizes code structure by moving newCommon to end of file
parser.go	Adds edition comment extraction support via field path 14
parser_test.go	Comprehensive test coverage for editions parsing, services, enums, and messages
fixtures/edition2023.proto	Test fixture demonstrating edition 2023 syntax and features
fixtures/edition2024.proto	Test fixture demonstrating edition 2024 syntax and features
fixtures/generate.go	Updates descriptor set generation to include new edition files
utils/protobuf_test.go	Updates test assertions to account for additional proto files in descriptor set

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