Replace Console with a logger

[kubukoz]

Having a logger would allow us to customize the levels of information being logged in debug/production mode more easily. We already have logback and slf4j in the dependencies because http4s brings them.

I think for the time being (while http4s is pulling in these logging libraries) the best course of action is to follow what we did in https://github.com/pitgull/pitgull: use https://github.com/valskalla/odin with an slf4j bridge.

If odin is to be used, that's blocked by its migration to Cats Effect 3. We also need to upgrade all other deps here to CE3 final before that happens: this would be just http4s and decline-effect.

[kubukoz]

This will now be much easier now that UserOutput exists. I think it can log directly to console (or console and debug level to file), but any other usages of Console should be loggers.