[wasi-common]: yanix now returns io::Error directly (#1242)

* Yanix now returns io::Error

This commit may seem somewhat controversial at first, but hear me
out first. Currently, Yanix would return a custom error that's a
wrapper around three other error types returned by various entities
inside Rust's `libstd`. In particular, Yanix's error type would wrap
`io::Error`, `num::TryFromIntError` and `ffi::NulError`. It turns
out that there is a natural conversion between the first and the last
and provided by the standard library, i.e., `From<ffi::NulError> for io::Error`
is provided. So at the surface it may seem that only the first two
wrapped error types are worth keeping.

Digging a little bit deeper into `libstd`, `num::TryFromIntError`
is essentially speaking only a marker that the integral conversion
went wrong. The struct implementing this error stores a unit type,
and nothing more. It therefore seems like a waste to wrap this
particular error when we could unify everything under `io::Error`.
And so, whenever we perform an int conversion, I suggest we simply
remap the error to `io::Error::from_raw_os_error(libc::EOVERFLOW)`
since this carries a comparable amount of information.

As a result of completely discarding `yanix::Error` custom error type,
we are invariably simplifying `yanix` itself, but also allowing
`wasi-common` to simplify in several places as well.

* Adapt wasi-common to changes in yanix

* Add Cargo.lock

* Unwrap try_into's where possible

* Remove unnecessary type annotation

crates/wasi-common/yanix/src/dir.rs

@@ -1,8 +1,8 @@
 use crate::{
     file::FileType,
     sys::dir::{iter_impl, EntryImpl},
-    Result,
 };
+use std::io::Result;
 use std::os::unix::io::{AsRawFd, IntoRawFd, RawFd};
 use std::{ffi::CStr, io, ops::Deref, ptr};