feat: add xsd:gMonthDay codec and data type

[mark-dropbear]

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[gemini-code-assist]

Summary of Changes

Hello @mark-dropbear, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the library's capabilities by adding support for the xsd:gMonthDay data type. It introduces a new GregorianMonthDay class to model this specific day-of-month concept, complete with constructors, parsing logic, and string serialization. The implementation ensures strict adherence to XSD validation rules for dates and timezones, making the library more compliant and versatile for XML Schema processing.

Highlights

• New Data Type Implementation: Introduced full support for the xsd:gMonthDay XML Schema built-in data type, including its representation, parsing, and serialization.
• Robust Validation: The new GregorianMonthDay class includes comprehensive validation for month, day, and optional timezone offset, ensuring data integrity according to XSD specifications.
• Codec Integration: A dedicated GregorianMonthDayCodec has been added, facilitating seamless conversion between string representations and GregorianMonthDay objects.
• Documentation and Testing: The CHANGELOG.md and README.md have been updated, and a thorough suite of unit tests has been added to verify the correctness and robustness of the new implementation.

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[gemini-code-assist]

Code Review

This pull request adds support for the xsd:gMonthDay data type, including the GregorianMonthDay class, its associated codec, and comprehensive unit tests. The implementation is well-structured and the tests cover a good range of cases. I've found a minor documentation error in the README and a few opportunities to improve code clarity by removing redundant code. Overall, great work on adding this new feature.