Test accessing sub_path.
On Windows, sub_path should be encoded as WTF-8.
On WASI, sub_path should be encoded as valid UTF-8.
On other platforms, sub_path is an opaque sequence of bytes with no particular encoding.
Be careful of Time-Of-Check-Time-Of-Use race conditions when using this function. For example, instead of testing if a file exists and then opening it, just open it and handle the error for file not found.
pub fn access(dir: Dir, io: Io, sub_path: []const u8, options: AccessOptions) AccessError!void
pub fn access(dir: Dir, io: Io, sub_path: []const u8, options: AccessOptions) AccessError!void {
return io.vtable.dirAccess(io.userdata, dir, sub_path, options);
}