[whatwg/url] Add named validation errors (#514)

Closes #406.

@TRowbotham I took some time to rebase #502 (what helps a lot is squashing first) and I think it worked out, but I didn't want to overwrite your branch without checking with you.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/514

-- Commit Summary --

  * Add named validation errors

-- File Changes --

    M url.bs (421)

-- Patch Links --

https://github.com/whatwg/url/pull/514.patch
https://github.com/whatwg/url/pull/514.diff

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