Huge logging overhaul

Summary

Functional Changes

• Add log levels to the logger.
• Allow specifying a logger to the health handler to allow the user to specify log level.
• Change the logger package name to saltlog for easier readability in code and to avoid import aliasing.

Bug Fixes

• Fix Panicf to include the component name.
• Swap the args in the f log functions. It makes more sense to specify the component before the message.