Introduce code generation (#2901)

![CleanShot 2023-08-28 at 12 24
36@2x](https://github.com/zed-industries/zed/assets/482957/f97cb399-1ac2-4fa9-94a7-137d1eec711c)


Release Notes:

- Added a new "Inline Assist" feature that lets you transform a
selection or generate new code at the cursor location by hitting
`ctrl-enter`.

crates/zed/src/zed.rs

@@ -264,8 +264,9 @@ pub fn initialize_workspace(
                                 toolbar.add_item(breadcrumbs, cx);
                                 let buffer_search_bar = cx.add_view(BufferSearchBar::new);
                                 toolbar.add_item(buffer_search_bar.clone(), cx);
-                                let quick_action_bar =
-                                    cx.add_view(|_| QuickActionBar::new(buffer_search_bar));
+                                let quick_action_bar = cx.add_view(|_| {
+                                    QuickActionBar::new(buffer_search_bar, workspace)
+                                });
                                 toolbar.add_item(quick_action_bar, cx);
                                 let project_search_bar = cx.add_view(|_| ProjectSearchBar::new());
                                 toolbar.add_item(project_search_bar, cx);