chore: Custome http(s) request timeout support

[alberthuang24]

Related: #365

背景描述

当我进行多文件上传时. 经常会因为 zone request timeout 导致上传错误.

通过查看源码发现. https://github.com/qiniu/nodejs-sdk/blob/master/qiniu/zone.js#L65 没有设置请求超时时间. 默认的话 urllib 的超时时间为 5000ms. 当我在进行大量文件同时上传的时候, 由于带宽占用. 请求经常会超出 5000ms.

所以需要可以支持 用户自定义请求超时时间. 可以增加一个环境变量之类的. QINIU_NODESDK_REQUEST_MIN_TIMEOUT.

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[alberthuang24]

/assign bachue