[Tcode-Motion]

🎯 What: The register_csv function in stdlib/src/csv.rs was too long due to inline function implementations.
💡 Why: Extracting csv_parse_fn and csv_stringify_fn into standalone helper functions improves code readability and maintainability.
✅ Verification: Verified by running cargo fmt --all and cargo test --workspace --all-targets.
✨ Result: Reduced register_csv function complexity and improved maintainability.

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PR created automatically by Jules for task 11947700865980112213 started by @Tcode-Motion

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