Function canonicalized

pub fn canonicalized(path: impl Into<PathBuf>) -> PathBuf

Returns the same path config but with canonicalized paths.

This will take care of potential symbolic linked directories. For example, the tempdir library is creating directories hosted under /var/, which in OS X is a symbolic link to /private/var/. So if when we try to resolve imports and a path is rooted in a symbolic directory we might end up with different paths for the same file, like private/var/.../Dapp.sol and /var/.../Dapp.sol

This canonicalizes all the paths but does not treat non existing dirs as an error