refactor(Embed): use embedLength function from builders (#8735)

packages/discord.js/src/structures/Embed.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const { embedLength } = require('@discordjs/builders');
 const isEqual = require('fast-deep-equal');
 
 /**
@@ -181,13 +182,7 @@ class Embed {
    * @readonly
    */
   get length() {
-    return (
-      (this.data.title?.length ?? 0) +
-      (this.data.description?.length ?? 0) +
-      (this.data.fields?.reduce((prev, curr) => prev + curr.name.length + curr.value.length, 0) ?? 0) +
-      (this.data.footer?.text.length ?? 0) +
-      (this.data.author?.name.length ?? 0)
-    );
+    return embedLength(this.data);
   }
 
   /**