Return a `Fold` struct when querying the `FoldMap`

This contains a new `id` field that lets us distinguish among folds.

Co-Authored-By: Nathan Sobo <nathan@zed.dev>
3ff8c78b58Antonio Scandurra committed on 11/15/2023, 4:09:59 PMparent851a60a
6 files changedLine totals unavailable