This commit adds tests that pass bad options to uv_fs_copyfile(),
uv_fs_read(), and uv_fs_write(). These tests verify that the
asynchronous version of these functions do not hold the event
loop open on bad inputs.
Refs: https://github.com/nodejs/node/pull/18811
PR-URL: https://github.com/libuv/libuv/pull/1747
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>