taro3.x: subPackages分包处理解决包测试过大问题

分包使用tabar，tabar定义的页面不能分包：

pages: [
    'pages/index/index',
    'pages/user/login/phone/index',
    'pages/chat/index',
    'pages/search/index',
    'pages/user/index'
  ],
  subPackages: [
    {
      root: 'pages/newhouse/',
      pages: [
        'index/index',
        'list/index',
        'search/index',
        'detail/index'
      ]
    }
  ],

tabBar: {
    color: 'rgba(68, 68, 68, 1)',
    selectedColor: 'rgba(68, 68, 68, 1)',
    backgroundColor: 'white',
    list: [
      {
        iconPath: './assets/icons/home.png',
        selectedIconPath: './assets/icons/home_hv.png',
        text: '首页',
        pagePath: 'pages/index/index'
      },
      {
        iconPath: './assets/icons/chat.png',
        selectedIconPath: './assets/icons/chat_hv.png',
        text: '微聊',
        pagePath: 'pages/chat/index'
      },
      {
        iconPath: './assets/icons/user.png',
        selectedIconPath: './assets/icons/user_hv.png',
        text: '我的',
        pagePath: 'pages/user/index'
      }
    ]
  }