Migrate to FastAPI

[jmccand]

Wait to merge until after #268 !

Describe what you are trying to do
FastAPI provides a few benefits to Flask:

• FastAPI supports asynchronous programming, which:
  • Makes it faster than Flask (latency)
  • Enables it to support a higher volume of connections (throughput)
  • Enables Shubble to asynchronize our data pipeline, which has the potential to eliminate the up-to-10 second delay detailed in Potentially long refresh times #251

Steps for review
Test everything, both on host and in docker:

• server: uvicorn shubble:app
• worker: python -m server.worker
• client: npm run dev
• test-client: cd test-client && npm run dev
• test-server: python -m test-server.server

You can run docker compose --profile "*" up to run all in docker.

Issues
Related to #251

[RichardJSun]

I don't think this gets invalidated anymore on worker updates

[jmccand]

Good point! I decreased the cache period to 5 seconds and opened an issue for cache invalidation #273.