Feature Request: Add possibility so set default logging level for all mlr3-related loggers

[sebffischer]

I find it somewhat annoying to having to silence different loggers and I can imagine it is also like this for users, for whom it's not even clear which loggers they have to change in order to get a less verbose output.

We could support an option mlr3.logging_level that is used by all packages from the mlr3 ecosystem.

[be-marc]

I think we could solve this with inheritance https://cran.r-project.org/web/packages/lgr/vignettes/lgr.html#hierarchy. We could add a mlr3_ecosystem logger and the other logger inherit from it.

[be-marc]

Might be a little bit tricky when bbotk is loaded without mlr3 but solvable.

[sebffischer]

Maybe the base class goes in mlr3misc?