url, i18n: update IDNA handling
The PR is still somewhat of a WIP, as a proof-of-concept that the proposed changes to the URL Standard work (https://github.com/whatwg/url/pull/309).
Refs: https://github.com/whatwg/url/pull/309 Refs: https://github.com/w3c/web-platform-tests/pull/5976
/cc @domenic @zimbabao
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
url