Implement xsd:integer 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:integer XML Schema Definition datatype within the library. It provides a robust codec that accurately converts between string representations and Dart's BigInt objects, adhering to XSD specifications for integer parsing, including whitespace collapse. This enhancement significantly broadens the library's capability to correctly process integer values as defined by XML Schema standards.

Highlights

• New xsd:integer Codec: A new XsdIntegerCodec has been implemented to handle the xsd:integer datatype, enabling conversion between string representations and Dart's BigInt type.
• Documentation Update: The README.md has been updated to reflect full support (encoding and decoding) for the xsd:integer datatype.
• Comprehensive Testing: Dedicated unit tests have been added for the XsdIntegerCodec, covering various scenarios including valid integer parsing, whitespace handling, and error cases for invalid inputs.

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[gemini-code-assist]

Code Review

This pull request correctly implements the xsd:integer codec, including the encoder, decoder, and tests. The implementation is clean and follows the project's structure. I've added a few suggestions to improve code style consistency, remove unused imports, and enhance test coverage for edge cases. Overall, great work!

[gemini-code-assist]

To improve test coverage, it would be good to add test cases for empty and whitespace-only strings, as these are important edge cases for the decoder.

      expect(() => codec.decode('12.3'), throwsFormatException);
      expect(() => codec.decode('abc'), throwsFormatException);
      expect(() => codec.decode(''), throwsFormatException);
      expect(() => codec.decode('   '), throwsFormatException);