* feat(global, download): add —delay flag
* feat(forward): support —delay flag
* feat(upload): support --delay flag
* doc(en/zh): add `—delay` in global-config doc
* refactor(iter): use HasNext() in guard of Next()
* Revert "refactor(iter): use HasNext() in guard of Next()"
This reverts commit 7a110fa069.
* Revert "feat(upload): support --delay flag"
This reverts commit 24ab0b50d9.
* Revert "feat(forward): support —delay flag"
This reverts commit 12c4f060de.
* Revert "feat(global, download): add —delay flag"
This reverts commit 735bbc74
* feat(global): support set delay duration between each task
---------
Co-authored-by: iyear <ljyngup@gmail.com>