(Feature request) Add socks5 for SFTP

[NearestWater262]

I been using this app to add SFTP support for the default Android Files app: https://github.com/AlainKnaff/Android-SFTP-Documents-Provider

However, sometimes i like to use Material Files, and even though it has SFTP support, that SFTP feature doesnt have Socks5 proxy support, which the above app does have it. Please add it if you can.

https://github.com/AlainKnaff/Android-SFTP-Documents-Provider/blob/0.2.16/app/src/main/java/com/island/sftp/SFTP.java#L113

[zhanghai]

Note: That app is using JSCH and its SOCKS5 proxy code is at AlainKnaff/Android-SFTP-Documents-Provider@cf67b7e . This app is using sshj right now and requires a different impl. I found hierynomus/sshj#841 .

[NearestWater262]

@zhanghai is this related? hierynomus/sshj@15d6924

hierynomus/sshj#970

hierynomus/sshj#971