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Add filesystem interaction
This PR introduces filesystem interactions by pragmatically invoking the system shell. It is part of the broader strategy outlined in https://github.com/fortran-lang/stdlib/pull/865 (see https://github.com/fortran-lang/stdlib/pull/865#pullrequestreview-2259189900) to support file zipping and unzipping. These functionalities are essential for handling .npz
files.