feat: add xsd:decimal codec

[mark-dropbear]

No description provided.

[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 introduces full support for the xsd:decimal XML Schema data type within the library. By adding a new codec, the library can now accurately parse and serialize decimal numbers, ensuring compliance with XSD 1.1 specifications and enhancing the precision of numerical data handling. This change improves the robustness and completeness of the library's datatype support.

Highlights

• New Codec Implementation: A new XsdDecimalCodec has been implemented to handle the xsd:decimal XML Schema data type, allowing for precise encoding and decoding of decimal values.
• Documentation Updates: The CHANGELOG.md has been updated to reflect the addition of the xsd:decimal codec, and the README.md now marks xsd:decimal as fully supported in the datatype compatibility table.
• Comprehensive Testing: Dedicated unit tests have been added for the XsdDecimalCodec, covering various scenarios including valid encoding, valid decoding (with whitespace handling), and error handling for invalid decimal formats.

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[gemini-code-assist]

Code Review

This pull request introduces a codec for the xsd:decimal data type, complete with implementation, tests, and updates to documentation. The implementation is well-done, correctly handling whitespace collapsing and validation as per the XSD specification. The tests cover the primary scenarios. My review includes suggestions to enhance test coverage for decimal parsing to ensure robustness and to add missing newline characters at the end of a couple of files, which is a common convention.