🐛 not proxy document anymore to avoid causing dom type checking exception

[kuitos]

changelist:

1. 合并了 appendChild 和 insertBefore 方法的重写
2. 不再代理 document，改为重写 Document.prototype.createElement 并从 this 中确认当前沙箱身份

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• resolve [Bug] 在低版本 chrome 下，覆盖了子应用的 document 导致报错 #841
• resolve [Bug] dynamicHeadAppend singular 模式下劫持 document.createElement 存在漏洞 #668
• resolve 子服务使用element-ui: Failed to execute 'getComputedStyle' on 'Window': parameter 1 is not of type 'Element'. #634

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This change is 

[howel52]

LGTM