fix bug with uvicorn and prometheus conflicting#12
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…er with live reload now works
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Fix bug with uvicorn and prometheus conflicting, causing the program to crash.
When uvicorn starts the server, it imports server.py, rerunning all top-level code. This causes prometheus to create duplicate metrics and throw an error.
I created a metrics handler class to handle all prometheus metrics. This change is compatible with uvicorn's live reload