General clean up

[martastain]

This pull request introduces several maintenance and refactoring changes aimed at improving the codebase.

• Corrections and enhancements have been made to the typing system to ensure better code reliability and readability.
• Experimental support for Granian, a Rust-based alternative to Gunicorn/Uvicorn.
• Use buffered responses instead of streaming for proxy range request as scrubbing causes a lot of cancelled requests, which are hard to handle.