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>

Cargo.lock

@@ -2301,6 +2301,7 @@ dependencies = [
  "collections",
  "db",
  "editor",
+ "emojis",
  "extensions_ui",
  "feedback",
  "futures 0.3.28",
@@ -3281,6 +3282,7 @@ dependencies = [
  "copilot",
  "ctor",
  "db",
+ "emojis",
  "env_logger",
  "futures 0.3.28",
  "fuzzy",
@@ -3349,6 +3351,15 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "emojis"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ee61eb945bff65ee7d19d157d39c67c33290ff0742907413fd5eefd29edc979"
+dependencies = [
+ "phf",
+]
+
 [[package]]
 name = "encode_unicode"
 version = "0.3.6"