fix SSL through SSH jump

[amne]

Description

Attempt to fix https://github.com/dbcli/mycli/issues/1176 The error is caused by paramiko.channel.Channel class that implements a subset of python's socket API and cannot be properly wrapped in SSL because of this.

These changes replace the use of Channel with a straightforward approach of opening a python socket to local bound host and port of a tunnel to the jump host.

Checklist

• [x] I've added this contribution to the changelog.md.
• [x] I've added my name to the AUTHORS file (or it's already there).

[amjith]

Thank you for the fix.

[amjith]

@amne Does this need to to go in setup.py as well right here?

[amne]

hi @amjith , I think it should if it helps long-term.