Investigate alternatives to gunicorn settings in REST API

[bogdankostic]

We run the REST API server using the following command:
gunicorn rest_api.application:app -b 0.0.0.0 -k uvicorn.workers.UvicornWorker --workers 1 --timeout 180

We suspect that changing the settings could help us make the application more robust and efficient.

[bogdankostic]

As we're currently using a single uvicorn worker, there's no need to use a gunicorn server as the process manager - we can directly use uvicorn as suggested in the FastAPI Docs.