Rewrite with Appache Commons Net

[u5surf]

https://github.com/orgs/embulk/discussions/27

[dmikurube]

Thanks for your pull request, but as written in the Discussion and the recent article, I wondered if you could leave a comment there before starting to work on it.

If you're interested in it, please let us know in this Discussion at first.
https://github.com/orgs/embulk/discussions/27

Let’s work on them together, collaborating and discussing with us.
https://www.embulk.org/articles/2024/11/28/looking-for-long-term-maintainers.html

ということで、長期的に関わりたいという人や組織は、引き続き歓迎しています。まずはスターター・プロジェクトを見てみて、これならやれるかも、というところに、ぜひコメントを残していってください。
https://zenn.dev/dmikurube/articles/looking-for-long-term-embulk-maintainers-ja

Let us take a look once it's ready, but we'd basically like to discuss how we go on it before actually working on it.