Move Settings to its own crate

Co-authored-by: Keith Simmons <keith@zed.dev>

crates/vim/src/vim.rs

@@ -10,7 +10,8 @@ use editor::{CursorShape, Editor};
 use gpui::{action, MutableAppContext, ViewContext, WeakViewHandle};
 
 use mode::Mode;
-use workspace::{self, Settings, Workspace};
+use settings::Settings;
+use workspace::{self, Workspace};
 
 action!(SwitchMode, Mode);