[Feature] Add a "contributors" field to module metadata

[T145]

Presently there's only the "author" field, which only allows for one contributor, being the module's initial creator. It would nice if there were another field to at least mention other contributors, and foster more of a developer movement around this program.

[lanmaster53]

We are already doing this. For example, the interesting_files module has this:

'author': 'Tim Tomes (@lanmaster53), thrapt (thrapt@gmail.com), Jay Turla (@shipcod3), and Mark Jeffery',

This is sufficient. It accomplishes what it needs to without overcomplicating the metadata. Thank you for the feedback though.