Extract paths out of util (#13182)

This PR extracts the definition of the various Zed paths out of `util`
and into a new `paths` crate.

`util` is for generic utils, while these paths are Zed-specific. For
instance, `gpui` depends on `util`, and it shouldn't have knowledge of
these paths, since they are only used by Zed.

Release Notes:

- N/A

crates/settings/Cargo.toml

@@ -22,6 +22,7 @@ fs.workspace = true
 futures.workspace = true
 gpui.workspace = true
 lazy_static.workspace = true
+paths.workspace = true
 release_channel.workspace = true
 rust-embed.workspace = true
 schemars.workspace = true