[whatwg/url] Add URL path equality and prefix comparison (PR #929)

Cookies needs to compare URL paths, both for equality and for whether one path
contains another. Comparing serializations is not right for either: an opaque
path can serialize identically to a list of URL path segments, and one path's
serialization can be a prefix of another's without covering whole segments.

Also let the URL path serializer take a URL path, so that callers holding one no
longer have to inline it, and record that a URL path segment never contains
U+002F (/), which is what makes the prefix comparison meaningful.

Closes #814.

Tests: https://github.com/web-platform-tests/wpt/pull/62165


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  https://github.com/whatwg/url/pull/929

-- Commit Summary --

  * Add URL path equality and prefix comparison

-- File Changes --

    M url.bs (61)

-- Patch Links --

https://github.com/whatwg/url/pull/929.patch
https://github.com/whatwg/url/pull/929.diff

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