Add support to forward traffic to SSH tunnel

[ttosta-google]

Feature Description

Per customer request, the Connector should support SSH tunnel traffic forwarding.

Alternatives Considered

SOCKS proxy is one of the methods that can be used to connect, but it requires more effort from end users to set up correctly.

[enocom]

A good possible library for this: https://github.com/hierynomus/sshj.

[enocom]

Or this: https://github.com/apache/mina-sshd