Document emoji picker (#4338)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

shared/editor/lib/emoji.ts

@@ -0,0 +1,14 @@
+import data, { type EmojiMartData } from "@emoji-mart/data";
+import snakeCase from "lodash/snakeCase";
+
+/**
+ * A map of emoji shortcode to emoji character. The shortcode is snake cased
+ * for backwards compatibility with those already encoded into documents.
+ */
+export const nameToEmoji = Object.values((data as EmojiMartData).emojis).reduce(
+  (acc, emoji) => {
+    acc[snakeCase(emoji.id)] = emoji.skins[0].native;
+    return acc;
+  },
+  {}
+);