feat: filesystem error handling #1006
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A derived type
fs_errorcontaing an integercodeand a fixed-length string is added for concise error handlingThis is kind of a stripped down version of
state_typealready present in thestdlib, syntax is also kept very similar... except the introduction ofcodeto store integers returned by C functions such asGetLastError(Windows API), global variables likeerrno(Posix platforms)Do let me know your thoughts