Add support to connect via ProxyJump option

[phandox]

Hi would you consider adding option to connect to target via jump host? My flow is that I have setup ProxyJump option in my SSH config and I do all my SSH connection via bastion host. I would like some simple API to specify the jump host connection.

[cacharle]

For anyone passing by with the same issue. There is a less known library that does this: https://github.com/appleboy/easyssh-proxy