[whatwg/url] Add fast path to pathname start state (PR #847)

This particular change adds a fast-path for implementors. We already use this in Ada (available at https://github.com/ada-url/ada/blob/main/src/parser.cpp#L650).

This change removes the performance penalty of URLs ending with `/`. As someone can imagine, it's pretty common for a user to send a request to `https://ada-url.com/`.

This particular change improved the performance of Ada ~9-10%. https://github.com/ada-url/ada/pull/59


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  https://github.com/whatwg/url/pull/847

-- Commit Summary --

  * Add fast path to pathname start state

-- File Changes --

    M url.bs (3)

-- Patch Links --

https://github.com/whatwg/url/pull/847.patch
https://github.com/whatwg/url/pull/847.diff

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