When bundled, we will retrieve it out of the `Resources` folder.
Locally, we're expected to run `script/download-rust-analyzer` and
put `vendor/bin` in our $PATH.
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>
