要求设计 LazyMan 类，实现以下功能

LazyMan('Tony');
// Hi I am Tony
 
LazyMan('Tony').sleep(10).eat('lunch');
// Hi I am Tony
// 等待了10秒...
// I am eating lunch
 
LazyMan('Tony').eat('lunch').sleep(10).eat('dinner');
// Hi I am Tony
// I am eating lunch
// 等待了10秒...
// I am eating diner
 
LazyMan('Tony').eat('lunch').eat('dinner').sleepFirst(5).sleep(10).eat('junk food');
// Hi I am Tony
// 等待了5秒...
// I am eating lunch
// I am eating dinner
// 等待了10秒...
// I am eating junk food

 class Lazy{
   constructor(name){
     console.log('Hi I am Tony')
   }
 }
 function LazyMan(name) {
   return new Lazy(name);
 }

class Lazy{
   constructor(name){
     // 这个数组是我们的任务队列，保存这一个个函数，可能是异步也可能是同步
     this.cbs=[];
     console.log('Hi I am Tony')
     // 创建一个微任务，微任务里面遍历执行每个任务(微任务不会立即执行，会在script执行栈执行完再开始)
     this.runcbs()
   }
   runcbs(){
     Promise.resolve().then(async res=>{
       while(this.cbs.length){
         // 移出任务队列中第一个元素，并且执行
         await this.cbs.shift()()
       }
     })
   }
   eat(meal){
     this.cbs.push(()=>console.log(`I am eating ${meal}`));
     // 链式调用
     return this;
   }
   sleep(time){
   // 队列中加入异步任务，会同步执行
     this.cbs.push(()=>new Promise(res=>{
       setTimeout(()=>{
         console.log(`等待了${time}秒...`)
         res();
       },time*1000)
     }))
     return this;
   }
   sleepFirst(time){
     this.cbs.unshift(()=>new Promise(res=>{
       setTimeout(()=>{
         console.log(`等待了${time}秒...`)
         res();
       },time*1000)
     }))
     return this;
   }
 }
 function LazyMan(name) {
   return new Lazy(name);
 }
 
 LazyMan('Tony').eat('lunch').eat('dinner').sleepFirst(5).sleep(10).eat('junk food');