Specification alignment tracking issue

[crowlKats]

updating wpt testdata makes following nonalignment evident:

• Split forbidden host/domain code points, and add all C0 controls and add U+007F to the latter whatwg/url#685 (add all C0 controls and add U+007F to is_invalid_domain_char #747)
• Forbid | in URL hosts whatwg/url#589 (Forbid | in URL hosts #751)
• [url] Add a few url tests to cover cases that were not tested before. web-platform-tests/wpt#25987
• Changes to file URL path normalization whatwg/url#544 (Changes to file URL path normalization #642)
• Additional file URL tests web-platform-tests/wpt#28432
• Fix file URL reparse issue whatwg/url#550
• Non-special URLs were not idempotent whatwg/url#505 (URLs containing no host and a path starting with ./ or ../ are not serialized idempotently #601)
• What should new URL("#") return? whatwg/url#539 (fix testdata runner #752)
• Reject non-IPv4 hostnames that end in numbers. whatwg/url#619 (Align IPv4 parsing to spec #753)

[lucacasonato]

For some background on what this issue is:

We (the Deno project) use rust-url internally extensively. The crate is currently about 1.5 years out of sync with the spec. We are going to try to get it back up to 100% PASS in the next couple of weeks. The tenative plan of action is as follows:

1. Update the WPT testdata file in this repo with all of the new tests that still pass (Update WPT testdata for passing tests #743).
2. Figure out which tests are blocked by which spec changes (we'll add that analysis to this issue).
3. Implement the relevant spec changes and add the corresponding tests. In some cases this may be as simple as updating the WPT test runner.