Implement basic simulation server

[fwcd]

This PR begins implementing the simulation server with the following endpoints:

• /: Web interface
  • Lets users edit edges (links) between connected (CLI) nodes
  • Displays broadcasts between nodes in real-time
• /messaging: WebSocket endpoint
  • This endpoint is where the CLI nodes (and the web interface) connect to for sending and receiving messages
  • Uses a simple JSON-based protocol with structures defined in a new package DistributedChatSimulationProtocol