Use PosixFileStream for files on POSIX#1855

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BCSharp wants to merge 3 commits intoIronLanguages:mainfrom BCSharp:open_file_posix

+531-107

Commits on Dec 30, 2024

Use PosixFileStream for files on POSIX
BCSharp
committed

Commits on Dec 31, 2024

Improve non-buffering strategy for FileStream
BCSharp
committed

Commits on Jan 1, 2025

Ignore OSException along with IOException
BCSharp
committed