Clearml-session

Features and Bug Fixes

- Fix session running with `clearml-agent` in virtual environment mode should not change `.profile`/`.bashrc`

Features and Bug Fixes
- Fix ssh server as subprocess, it should die with the Task
- Fix running Jupyter/VScode from virtual-environment agent
- Fix vscode without Jupyter
- Add support for multiple `clearml-session` running in parallel
- Add always retrieve all running sessions of the current user
- Add --jupyter-lab turning on/off Jupyter lab installation.
- Add --username to support non root ssh login (venv agents)
- Fix support for Jupyter Lab v3
- Change default Jupyter server to 127.0.0.1
- Raise error if trying to connect to the demo server

Features and Bug Fixes
- Improve stable connection layer on Windows

ClearML-Session - CLI for launching JupyterLab / VSCode on a remote machine
Requires [ClearML-Agent](https://github.com/allegroai/clearml-agent) running on remote machine