feat: add xsd:nonPositiveInteger codec

[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 expands the library's XML Schema datatype handling by introducing full support for xsd:nonPositiveInteger. This enhancement allows the system to correctly parse, validate, and serialize integer values that are zero or negative, aligning the library more closely with the XSD 1.1 standard.

Highlights

• New XSD Datatype Support: Implemented a new codec for xsd:nonPositiveInteger, allowing for proper encoding and decoding of non-positive integer values according to the XML Schema Definition (XSD) 1.1 specification.
• Data Type Validation: The new codec includes robust validation to ensure that only non-positive integer values (less than or equal to zero) are processed, throwing FormatException for invalid inputs during both encoding and decoding.
• Documentation and Testing: Updated CHANGELOG.md and README.md to reflect the new datatype support, and comprehensive unit tests have been added to ensure the correctness and reliability of the xsd:nonPositiveInteger codec.

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[gemini-code-assist]

Code Review

This pull request introduces a codec for the xsd:nonPositiveInteger data type, complete with an encoder, decoder, and unit tests. The implementation is well-structured and aligns with the existing patterns in the project. I have one minor suggestion to correct a typo in the test file for better consistency.