Decide how to handle logging in public class methods that don't have access to a logger

[lawrence-forooghian]

We've introduced a +[ARTInternalLogHandler classMethodLogger], to be used in this situation. Currently it creates a logger whose log level is .none, so it doesn't emit any log messages. Let's decide what the right thing to do is here.

Also, if we do end up deciding not to log any messages, then might it be better to allow nil loggers throughout the codebase instead of having to create a no-op logger?

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