toon-rust 0.1.3

Token-Oriented Object Notation (TOON) - JSON for LLM prompts at half the tokens. Rust implementation.
Documentation
## Description
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## Type of Change
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- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [ ] Documentation update
- [ ] Performance improvement
- [ ] Code refactoring

## Related Issues
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Closes #

## Changes Made
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## Testing
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- [ ] Added new tests
- [ ] Updated existing tests
- [ ] All tests pass locally
- [ ] Tested with example code

## Checklist
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- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published

## Additional Notes
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