os: add os.stat() and helpers #20739
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Adds a platform-agnostic Stat struct and os.stat() function to provide stat() functionality as it is found in other languages and to make it possible to simplify other functions within os like file_size() by consistently using Stat.
Helper functions for the Stat struct have been added to make working with stat info dev-friendly, specifically get_{a|c|m}time() to return a Time struct instead of just the unix epoch and get_filetype() and get_mode() which use existing os structs (FileType, FilePermissions, and FileMode).
Handling of stat-related info is quite different in Windows than in *nix; the required C code has been split up accordingly.