detect interactive input

[feloy]

For commands, detect is the cli is executed in an interactive context (terminal), and adapt the scenario if it is interactive:

In interactive mode:

• during init, if some flags are not provided (agent, runtime, etc), provide to the user the list of possible values, and ask to pick one
• during start/stop/remove/terminal, if the instance is not in a correct state, ask the user if the state should be changed (eg 'the workspace must be stopped before to remove it, do you want to stop it?')
• etc

In non interactive mode (scripts, called from UI), do not change and return errors