Thalia Archibald 41b04653f3 Trusty: Implement write_vectored for stdio
Currently, `write` for stdout and stderr on Trusty is implemented with
the semantics of `write_all`. Instead, call the underlying syscall only
once in `write` and use the default implementation of `write_all` like
other platforms. Also, implement `write_vectored` by adding support for
`IoSlice`.

Refactor stdin to reuse the unsupported type like #136769.
2025-03-27 16:49:30 -07:00
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