Auto merge of #109698 - epage:wtf, r=Amanieu

Allow limited access to `OsStr` bytes

`OsStr` has historically kept its implementation details private out of
concern for locking us into a specific encoding on Windows.

This is an alternative to rust-lang#95290 which proposed specifying the encoding on Windows.  Instead, this
only specifies that for cross-platform code, `OsStr`'s encoding is a superset of UTF-8 and defines
rules for safely interacting with it

At minimum, this can greatly simplify the `os_str_bytes` crate and every
arg parser that interacts with `OsStr` directly (which is most of those
that support invalid UTF-8).

Tracking issue: #111544

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