chore: use goreman to start principal and agent

[jparsai]

This PR is to make use of goreman to run principal and agent in same console, this would make debugging easy as logs of both components would be printed in same console, also it would help to understand the order of execution of agent and principal code blocks.

[jannfis]

Thanks, I do like this idea.

However, I think neither goreman nor make configuration should be part of the top-level for now.

My suggestion would be to place the Procfile into (a new) hack/demo-env/Procfile and Makefile (if required at all) into hack/demo-env/Makefile instead.

[jannfis]

Also, I think that there really should be two agent targets in Procfile, agent-managed and agent-autonomous. Or some logic that lets you start one or the other.

[jparsai]

Thanks for looking into this. I moved Procfile inside hack/demo-env/ directory, but moving Makefile requires changes in start up scripts, because they have to be executed from root folder. I was not sure if I should modify start up scripts for this.
To set agent mode I introduced an env variable AUTONOMOUS_MODE, which can be used like this

AUTONOMOUS_MODE=true make start-local