Make uvicorn logs be JSON. Refactor json_logging config

[pawbu]

As noted here logging is quite complicated with uvicorn.
I followed the advice here and that worked nicely.

[vaskalan]

Nice! :-)

[FISHMANPET]

I stumbled on this, since you referenced this issue here and decided to shamelessly copy it. One problem I noticed, in your log_config.yaml, the closing quote in your format strings is off, it should be this: "message": "%(message)s"}. Inside the bracket, to close off the message value, rather than outside the bracket.

However, that still doesn't generate "valid" JSON, specifically in the access logs. An access event message will look like this:
127.0.0.1:59506 - "GET /openapi.json HTTP/1.1" 200 OK including the quotes, so when that gets logged unescaped it becomes invalid JSON. I don't have an answer for that problem yet, but at least thought you should be aware.

[pawbu]

@FISHMANPET Good catch, thanks. We'll take a look at this issue.

[pawbu]

@FISHMANPET The fastapi-request-logger from FastAPI is enough for us right now so I removed log_config.yaml from the project.
encode/uvicorn#680 (comment) looks promising though.