feat(139): support multipart upload (close: #7444) #7630
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近期升级到新版个人云，被这个无法上传大文件的问题困扰。
#7444 (comment)
代码首先来自 https://github.com/ykxVK8yL5L/alist/tree/main/drivers/139 ，参考了部分代码，在此向 @ykxVK8yL5L 致谢！
如果文件分片数量大于 100 个，在网页端上传会使用第二个接口
/hcy/file/getUploadUrl获取上传地址，这里也加上了相关逻辑，支持分片数量超过 100。加上选项可供用户自定义分片大小，暂未修改原来的分片大小。
目前网页端的分片大小为 20 MB （20971520），实测该值过小可能会拖慢大文件的上传速度，故此处提供选项供用户自行研究。
新版个人云所使用的 EOS 文档（https://ecloud.10086.cn/op-help-center/api/article/40933）中说明“无法上传大小大于 5 GB 的对象”，之前不能上传 5 GB 以上文件的原因在此，故分片大小不要超过 5 GB。