Support emoji shortcodes in chat (#8455)

Completes: https://github.com/zed-industries/zed/issues/7299

Suggestions


https://github.com/zed-industries/zed/assets/53836821/2a81ba89-4634-4d94-8370-6f76ff3e9403

Automatically replacing shortcodes without using the completions (only
enabled when `message_editor` > `auto_replace_emoji_shortcode` is
enabled in the settings):


https://github.com/zed-industries/zed/assets/53836821/10ef2b4b-c67b-4202-b958-332a37dc088e






Release Notes:

- Added autocompletion for emojis in chat when typing emoji shortcodes
([#7299](https://github.com/zed-industries/zed/issues/7299)).
- Added support for automatically replacing emoji shortcodes in chat
(e.g. typing "👋" will be converted to "👋")

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/collab_ui/src/collab_ui.rs

@@ -16,6 +16,7 @@ use gpui::{
     actions, point, AppContext, GlobalPixels, Pixels, PlatformDisplay, Size, Task, WindowBounds,
     WindowContext, WindowKind, WindowOptions,
 };
+use panel_settings::MessageEditorSettings;
 pub use panel_settings::{
     ChatPanelSettings, CollaborationPanelSettings, NotificationPanelSettings,
 };
@@ -31,6 +32,7 @@ pub fn init(app_state: &Arc<AppState>, cx: &mut AppContext) {
     CollaborationPanelSettings::register(cx);
     ChatPanelSettings::register(cx);
     NotificationPanelSettings::register(cx);
+    MessageEditorSettings::register(cx);
 
     vcs_menu::init(cx);
     collab_titlebar_item::init(cx);