Turbopack: font weight sorting feedback (#72109)
This addresses @bgw’s feedback for #72043:
- Defers cloning
https://github.com/vercel/next.js/pull/72043#discussion_r1821815860
- Uses a `BTreeSet` in `FontAxesWeights::Fixed` to ensure it’s always
sorted, rather than sorting at url-generation-time
https://github.com/vercel/next.js/pull/72043#discussion_r1821821359
- `RcStr` `.to_owned()` -> `.clone()`
Test Plan: Unit tests
Co-authored-by: Benjamin Woodruff <benjamin.woodruff@vercel.com>
Closes PACK-3360
Co-authored-by: Benjamin Woodruff <benjamin.woodruff@vercel.com>
