refactor!: move embedLength function to util package (#11327)

BREAKING CHANGE: Builders no longer exports a `embedLength` function. Import it from `@discordjs/util` instead.

Co-authored-by: Danial Raza <danialrazafb@gmail.com>
Co-authored-by: Jiralite <33201955+Jiralite@users.noreply.github.com>

packages/util/__tests__/embedLength.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, test } from 'vitest';
+import { embedLength } from '../src/functions/embedLength.js';
+
+describe('embedLength', () => {
+	test('GIVEN an embed with specific amount of characters THEN returns amount of characters', () => {
+		const embed = {
+			title: 'yeet',
+			description: 'yeet',
+			fields: [{ name: 'yeet', value: 'yeet' }],
+			author: { name: 'yeet' },
+			footer: { text: 'yeet' },
+		};
+
+		expect(embedLength(embed)).toEqual('yeet'.length * 6);
+	});
+
+	test('GIVEN an embed with zero characters THEN returns amount of characters', () => {
+		expect(embedLength({})).toEqual(0);
+	});
+});