Using same session to modify enviroment

Hello,

Is there any way to do this
```
(let [agent (ssh-agent {})]
(let [session (session agent "host-ip" {:strict-host-key-checking :no})]
(with-connection session
(let [result (ssh session {:cmd "export TEST=1"})]
(println (result :out)))
(let [result (ssh session {:cmd "echo $TEST"})]
(println (second result)))))))
```
and the echo $TEST equals to 1? I tried the last code but the result of last print is empty. Is there any way to use the same session?

Start by tracing the session, with-connection, and ssh entry points to determine whether commands share a shell process or only an SSH connection. Reproduce the two-command example and consider the work complete when a supported way for TEST to persist between commands is documented or available.

Written by the indexing model from the issue text.