Chat/Web socket implementation

Because of #47 we'll have web socket functionality. So we can:

Stream intermediate tool selections the agent makes.
- Let the user know what's going on.

Implementation

[x] Use callback API from LangChain to handle intermediate events from the agent.
[x] Implement web socket feature with Flask.
[x] Stream tool selections and final answer using web socket.
[x] Change client UI to accommodate for the changes (chat history, user messages, Jelly messages, tool selection messages).
[x] Map tool names to nicer sounding messages, i.E.: stats tool ▶ I'm going to use the blockchain statistics tool for this.. 🔎.
[x] Improve UI to better fit for chat-history (auto-scroll)
[x] Wait for @eric-volz review
[x] Update process diagram with changes

Webinar with many great inspirations: YouTube