feat: implement xsd:float 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 introduces a dedicated codec for the xsd:float data type, which is crucial for accurately representing 32-bit floating-point numbers within the system. By implementing specific validation logic, the change ensures that double values are correctly constrained to the float value space during conversion, preventing data integrity issues and enhancing the library's compliance with XSD standards for numerical types.

Highlights

• New xsd:float Codec: Implemented a new XsdFloatCodec to handle the conversion between XSD float strings and Dart double values, ensuring proper serialization and deserialization of 32-bit floating-point numbers.
• 32-bit Float Validation: The codec includes robust validation for both encoding and decoding, utilizing Float32List to check if double values fit within the 32-bit float range. It throws ArgumentError for encoder overflows and FormatException for decoder overflows or underflows.
• Special Value Handling: The codec correctly handles special floating-point values such as NaN (Not a Number), INF (Positive Infinity), and -INF (Negative Infinity) according to XSD specifications.
• Documentation and Changelog Updates: The CHANGELOG.md has been updated to reflect the new feature, and the README.md now marks xsd:float as fully supported in the datatype compatibility table.
• Comprehensive Unit Tests: A new test file, test/codecs/float_codec_test.dart, has been added with extensive unit tests covering valid conversions, invalid string formats, and critical edge cases like overflow and underflow conditions for both encoding and decoding.

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[gemini-code-assist]

Code Review

This pull request introduces a codec for the xsd:float datatype, which is a great addition. The implementation correctly handles the conversion between Dart's 64-bit double and XSD's 32-bit float, including checks for overflow and underflow. The accompanying tests are also well-written. I have a couple of suggestions to enhance correctness and ensure stricter adherence to the XSD specification, along with corresponding test case additions.