🧪 [Testing Improvement: Add unit tests for runtime_to_sql_value in sqlite.rs]

[Tcode-Motion]

🎯 What: The testing gap in stdlib/src/sqlite.rs involving the runtime_to_sql_value function has been addressed by adding a comprehensive suite of unit tests.
📊 Coverage: The tests cover the conversion of RuntimeValue (Null, Bool, Int, Float, Str, and List) to the corresponding rusqlite::types::Value types, ensuring all branches of the match statement are validated.
✨ Result: Test coverage in the standard library's sqlite module has increased, improving the reliability and safety for future refactoring.

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PR created automatically by Jules for task 37922512560476531 started by @Tcode-Motion

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