[RFC] Add RFC 3986 and WHATWG compliant URL parsing support

[kocsismate]

2nd take after the failed experiment with #11315

RFC: https://wiki.php.net/rfc/url_parsing_api

[TimWolla]

I've just discussed with @kocsismate that this PR will likely be further split into separate PRs, since the size of the PR is giving me some troubles with GitHub's UI being laggy and also because GitHub already starts collapsing the comments.

Something like:

• ext/lexbor additions
• ext/uri skeleton (basic stub for exceptions, the vendored uriparser extension, ...)
• Then the actual logic.

[kocsismate]

Submitted:

• Add Lexbor files for URL handling #18656
• Add ext/uri skeleton along with uriparser #18658
• Add support for IDNA URL serialization lexbor/lexbor#281
• 7d24cce
• Add Uri\WhatWg classes to ext/uri #18672
• Add the Uri\Rfc3986\Uri class to ext/uri without wither support #18836
• Add support for copying Uri structures (fixes #200) uriparser/uriparser#230
• Add support for copying Uri structures (fixes #200) uriparser/uriparser#230
• 6637638
• Do not copy .hostData.ipFuture unnecessarily (follow-up to #230) uriparser/uriparser#237
• Add internal URI handling API #19073
• Add support for Uri\Rfc3986\Uri withers #19636:

[kocsismate]

I'm closing this PR as the majority of changes have already been merged as listed in #14461 (comment). The only notable exception is the withers of RFC 3986 implementation, but those require a full rework.