Parallel commands in agents

[nrbnlulu]

Sometimes an agent would need to run two or more commands at the same time.
Examples:

1. codegens with --watch
2. port forwarding from k8 / docker
3. listening to a websocket that will be affected by a subsequent API requests.

All of these cases are not feasible for an agent to accomplish and what would happen now
is that the agent would just freeze forever.