fix: 改用 int64 支持 32 位系统编译

[yahao333]

将 ListFileIterator 的 limit 和 curlNum 改为 int64 以支持 32 位系统编译

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}