Connect once and tunnel data

[izissise]

Is your feature request related to a problem? Please describe.
xxh opens multiple connections to the target host which can be problematic if there is a second step in the authentication process (TOTP).

xxh adds a big delay before first user input is possible when it must first transfer plugins files.

Describe the solution you'd like
These problems could be alleviated by opening a tunnel which would serve for file transfer, remote host could then prompts once minimal set of files is available (you don't need xxh-plugin-prerun-docker right away).

Files could even be lazy loaded by sending a request through the tunnel to the local xxh client for needed files (transfer vim conf only if you run vim on the remote).

Describe alternatives you've considered
Use zmodem instead of a ssh tunnel
http://www.linuxcertif.com/man/1/ztelnet/

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[anki-code]

Hi! Maybe you have a couple of bash commands with representation of the proof of concept? It would be a good start.