url: implement URL.prototype.toJSON

PR-URL: https://github.com/nodejs/node/pull/11236
Ref: https://github.com/whatwg/url/pull/229


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>