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/zed/Cargo.toml

@@ -70,6 +70,7 @@ notifications.workspace = true
 outline.workspace = true
 outline_panel.workspace = true
 parking_lot.workspace = true
+paths.workspace = true
 profiling.workspace = true
 project.workspace = true
 project_panel.workspace = true