[adapters] 优化多线程特性文件结构，增加部分多线程音频系统代码，支持 Worker 子包特性（默认不开启），修复 Devtools 下强制不启用 Worker 问题

adapters/platforms/wechat/res/game.js

@@ -1,6 +1,4 @@
-const { init: initWorker, onInited: onWorkerInited } = require('./worker_adapter/index.js');
 require('adapter-js-path');
-initWorker();
 __globalAdapter.init();
 require('cocos2d-js-path');
 require('physics-js-path');
@@ -19,8 +17,6 @@ if (cc.sys.platform !== cc.sys.WECHAT_GAME_SUB) {
     cc.macro.CLEANUP_IMAGE_CACHE = true;
 }
 
-const t = Date.now();
-onWorkerInited(() => {
-    console.log("worker waiting time:", Date.now() - t);
+__globalAdapter.onInited(() => {
     window.boot();
 });