Provide raw values alongside formatted strings in the wrapper

[hbisneto]

Problem: The wrapper only returns formatted strings (e.g., sizes with units), not raw numeric values

Why it matters: Programmatic use cases need raw timestamps (int) and sizes (bytes) for calculations.

Proposed solution: Add an optional raw=True flag or separate keys like size_raw and modified_ts in the returned dict.

Notes: Keep default behavior unchanged for backward compatibility.