f7f55ede2f
Closes https://github.com/astral-sh/uv/issues/3857 Instead of using custom `Arch`, `Os`, and `Libc` types I just use `target-lexicon`'s which enumerate way more variants and implement display and parsing. We use a wrapper type to represent a couple special cases to support the "x86" alias for "i686" and "macos" for "darwin". Alternatively we could try to use our `platform-tags` types but those capture more information (like operating system versions) that we don't have for downloads. As discussed in https://github.com/astral-sh/uv/pull/4160, this is not sufficient for proper libc detection but that work is larger and will be handled separately.