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Closes #136.
Adds a logger backend to the evaluation node, which backend logs messages to sender's group leader iff it's an instance of
Livebook.Evaluator.IOProxy
.This is essentially a stripped down version of
Logger.Backends.Console
. It reads basic configuration like log level and format from the same configuration, which may be handy when running inside a mix project, but let me know if it doesn't make sense.Also, is there a good way to test the backend in isolation?