refactor: import timers, process, and Buffer from node: (#7157)

Co-authored-by: muchnameless <12682826+muchnameless@users.noreply.github.com>
Co-authored-by: Almeida <almeidx@pm.me>

src/client/websocket/WebSocketManager.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const EventEmitter = require('node:events');
+const { setImmediate } = require('node:timers');
 const { setTimeout: sleep } = require('node:timers/promises');
 const { Collection } = require('@discordjs/collection');
 const { RPCErrorCodes } = require('discord-api-types/v9');