Upgrade CarlaViz to 0.9.14

[mjxu96]

• Support Carla 0.9.14
• Completely rewrite the backend part
  • Use Conan to manage dependency
  • Use latest xviz library
  • Update the backend code struture to potentially support more simulators and frontend connections
• Support changing map without exiting the backend
• Render static objects (e.g. buildings, traffic lights) in the browser
• Move more static parts to the metadata to reduce the real time traffic
• Rely on Github Actions for CI/CD