fix(url): handle tab/newline-only inputs in set_port

[watilde]

This change updates set_port so that when the input consists only of tab (\t), newline (\n), or carriage return characters, the port is left unchanged. Also adds these cases to ada_extra_setters_tests.json while waiting for their inclusion in WPT.

Refs: web-platform-tests/wpt#53420

[lemire]

My reading of the spec is as follows:

1. If we set the empty string, the do port = std::nullopt;.
2. Otherwise, try to parse the provided data as a 16-bit int, if this fails, return an error (and do not change the port).
3. Otherwise set the port.

So I think @watilde is correct. Anything non-empty that does not parse to a 16-bit integer should leave the port unchanged.

[lemire]

I think it is a genuine bug worth fixing.

[lemire]

I'll wait for @anonrig to react before we merge.

[anonrig]

It seems there are linting errors

[watilde]

Working on fixing the lint errors. I’ll push the changes shortly.

[watilde]

I ran clang-format to fix the lint errors, amended the previous commit, and force-pushed to keep the commit history clean.

[anonrig]

Thank you for your contribution