Catch up cli pt2

[olingern]

Description

Follow up to #234

This PR aims to:

• do some refactoring for test ability
• Create a "core" that isn't concerned with presentation, i.e. logging
• Move API construction to the api lib
• Use the injected logger instead of console.log
• Fix any breakage from #134

The idea I think the CLI can follow a sort of mvc style of structure, core being the model and the commands directory being the controller. We don't have a view at the moment, and it's not necessary to; however, it would be nice to have the option to explore #226 -- this would make that transition very easy.

Currently I'm testing and pushing packages against registry.entropic.dev because that version appears to be pre-#134, which is great. After the refactoring is done, I'll just switch over to my local docker instance and find the breakage and update api.js accordingly.

How to test

coming soon

[olingern]

So, this PR is coming along pretty well. Isolating publish was / is tricky because of its intermediary messages, but I solved passing this between the command and core with a "message broker" / EventEmitter.

What do you think of the current direction @chrisdickinson? My idea is that entropic's core could be wrapped up into a programmatic lib for people to use if they like ( in the distant future ), so I thought pulling things apart was worthwhile. This will also make #226 very straightforward.