get_or_create_session() should log when it loads configuration from a file

[jamie256]

Summary

When using the method without parameters, the logic for session configuration searches for special file names and attempts to load configuration from there, but it does not log where the configuration is being loaded from, leading to potentially confusing changes in behavior in environments where the existence of a configuration file changes behavior without changes in the code or indications in the log statements.

Steps to Reproduce it

create a file in your home directory named .whylogs.yaml and use our code examples with get_or_create_session() and note that we do not log where configuration is loaded from.

What is the expected correct behavior?

If configuration is loaded from files (or attempted to load) we should have some debug and info level output indicating this behavior to make it easier to understand what session configuration is loaded and from where.