Visualization of communication process between agents

[stukid]

To better help new developers understand how ANP works, we need expose the process of communication of agents, like DID creation, searching available agents, protocol negotiation, etc.

We now have logs to record the process, but need better visualization for beginners.

[stukid]

I have built a demo to pass progress messages from backend to frontend in realtime with SSE, I think it's feasible.

I'll try to take this issue and raise a PR.