Auto merge of #91871 - camelid:urlpartsbuilder, r=GuillaumeGomez

rustdoc: Add `UrlPartsBuilder`

This is a type for efficiently and easily constructing the part of a URL
after the domain: `nightly/core/str/struct.Bytes.html`.

It allows simplifying some code and avoiding some allocations in the
`href_*` functions.

It will also allow making `Cache.paths` et al. use `Symbol` without
having to allocate `String`s in the `href_*` functions. `String`s would
be necessary otherwise because `Symbol::as_str()` returns `SymbolStr`,
whose `Deref<Target = str>` impl requires the `str` to not outlive it.
This is the primary motivation for the addition of `UrlPartsBuilder`.

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