feat(thunder): add offline download tool

[Lanfei]

• 增加迅雷云盘的离线下载工具，仿照 pikpak 的写法实现

[KirCute]

@xhofe After #7655 is merged, all offline download tools need to return tool.status.TotalBytes (the total number of bytes of the downloaded file) in the Status function. So do not forget to add the assignment to TotalBytes in this PR before the next release is published.

[Lanfei]

@xhofe Sorry to bother, but I'd like to ask if there's any feedback or plans regarding this feature? :)

[KirCute]

@xhofe Sorry to bother, but I'd like to ask if there's any feedback or plans regarding this feature? :)

Generally, a new version is released every 2-4 weeks, and all PRs will be merged before the new version is released.

[Lanfei]

@xhofe Sorry to bother, but I'd like to ask if there's any feedback or plans regarding this feature? :)

Generally, a new version is released every 2-4 weeks, and all PRs will be merged before the new version is released.

Got it, thanks for replying.