Mainline GPUI2 UI work (#3079)

This PR mainlines the current state of new GPUI2-based UI from the
`gpui2-ui` branch.

Release Notes:

- N/A

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Nate <nate@zed.dev>

crates/ui/src/components.rs

@@ -5,7 +5,7 @@ mod chat_panel;
 mod collab_panel;
 mod command_palette;
 mod context_menu;
-mod editor;
+mod editor_pane;
 mod facepile;
 mod icon_button;
 mod keybinding;
@@ -31,7 +31,7 @@ pub use chat_panel::*;
 pub use collab_panel::*;
 pub use command_palette::*;
 pub use context_menu::*;
-pub use editor::*;
+pub use editor_pane::*;
 pub use facepile::*;
 pub use icon_button::*;
 pub use keybinding::*;