Unify logging approach for different logging libraries and console outputs

[whipson]

Currently, maestro uses R's native message, warning, and error system for logging pipeline messages. Other approaches like {logger} and print statements are not captured. Ideally, a user should be able to capture logs for each pipeline using a variety of approaches.

[JavOrraca]

Seconded! Thanks @whipson and @ryangarnett for the awesome package.