Add UI/UX for moving channels (#2976)

TODO:

- [x] Add drag and drop
- [x] Polish up in-flight decisions.
- [x] Fix chat panel panic
- [x] Add nice hover effect highlighting the matching ones
- [x] Fix and test keyboard

Release Notes:

- N/A

crates/project_panel/src/project_panel.rs

@@ -1513,7 +1513,7 @@ impl ProjectPanel {
         .as_draggable(entry_id, {
             let row_container_style = theme.dragged_entry.container;
 
-            move |_, cx: &mut ViewContext<Workspace>| {
+            move |_, _, cx: &mut ViewContext<Workspace>| {
                 let theme = theme::current(cx).clone();
                 Self::render_entry_visual_element(
                     &details,