src: do not ignore IDNA conversion error

Old behavior can be restored using a special `lenient` mode, as used in
the legacy URL parser.

PR-URL: https://github.com/nodejs/node/pull/11549


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>