output wrapper lib

[sullivtr]

Saw the previous MR adding the outputs for list orgs. Wanted to contribute to the output library. This adds the following:

• output package containing output.go, which provides the CLIPrint() func used to print yaml, json, or table to stdout, dependent on the cli input for output format.

[joshlreese]

Hey @sullivtr, great to see you. Thanks for the PR so early on!

I left some thoughts on the table building approach, and the marshaling changes.

[scotwells]

Thanks for the early contribution @sullivtr! Just some minor feedback on the UX, but I'm good with the changes as is.

[sullivtr]

(Sorry had to recommit because some ineffective code got added by accident when I was rebasing)