* [wasi] Update time & instant crates
In https://github.com/nushell/nushell/pull/2643 instant was updated by adding it as a hard dependency in Cargo.toml, but it's better to avoid it and only update in Cargo.lock via `cargo update -p ...`.
Additionally, updated `time` crate so that now some basic commands like `ls` work too, although formatting is pretty bad.
* Update default terminal width to 80
If termsize can't return anything, use 80 chars (e.g. on WASI).
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