Can you encapsulate Prox_ Jump? Reduce the difficulty of use

[TheBlindM]

https://github.com/bk-rs/ssh-rs/blob/main/async-ssh2-lite/demos/smol/src/proxy_jump.rs
Can you encapsulate Prox_ Jump? Reduce the difficulty of use, thank you.
Users can drop the method and use it directly.😂

[vkill]

This is more troublesome, I will mark it as To-Do.

[TheBlindM]

thank you