Implement sleep function

src/util/util/extensions/Global.ts

@@ -0,0 +1,11 @@
+declare global {
+	function sleep(ms: number): Promise<void>;
+}
+
+if (!globalThis.sleep) {
+	globalThis.sleep = function (ms: number): Promise<void> {
+		return new Promise((resolve) => setTimeout(resolve, ms));
+	};
+}
+
+export {};