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/terminal/Cargo.toml

@@ -17,7 +17,7 @@ doctest = false
 alacritty_terminal = { git = "https://github.com/alacritty/alacritty", rev = "cacdb5bb3b72bad2c729227537979d95af75978f" }
 anyhow.workspace = true
 collections.workspace = true
-dirs = "4.0.0"
+dirs.workspace = true
 futures.workspace = true
 gpui.workspace = true
 libc.workspace = true