substrait-explain 0.7.0

Explain Substrait plans as human-readable text.
Documentation 
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## Description

Brief description of what this PR does and why it's needed.

## Type of Change

- [ ] Bug fix
- [ ] New feature
- [ ] Documentation update
- [ ] Example update
- [ ] Other (please describe)

## Testing

- [ ] Added tests for new functionality
- [ ] All existing tests pass
- [ ] Ran examples to verify behavior

## Checklist

- [ ] Code follows Rust conventions
- [ ] Documentation updated if needed
- [ ] No breaking changes (or breaking changes documented)
- [ ] Pre-commit hooks pass

## Related Issues

Closes #(issue number)