Uvicorn Worker for Gunicorn

uvicorn-worker provides an enhanced Uvicorn worker for Gunicorn, designed to replace the workers previously bundled directly within the `uvicorn` package. This allows for independent development, future compatibility, and continued improvements of Uvicorn's Gunicorn integration. The current version is 0.4.0, and it follows an as-needed release cadence, often coinciding with `uvicorn` updates.