This is similar to the active entry, but it can remain assigned even if there is no active entry and we can potentially manipulate it in other scenarios such as interaction with the project browser. This prepares the ground to show the collaborators for the active worktree.
Also, move the high-level fuzzy mathcing functions in
zed::fuzzy into the fuzzy crate so that project can
use them.
This required defining a 'PathMatchCandidateSet' trait
to avoid a circular dependency from fuzzy to worktree.
Co-Authored-By: Nathan Sobo <nathan@zed.dev>
