Explore multi-attribution support

## Problem

The licenses and situations allow for multiple Attribution parties, and while the Chooser will pass along a comma separated list of Authors. It won't allow for multiple links or sites as well.

## Description

We should consider a straightforward method to allow and end-user to input multiple authors within the Mark when desired.

## Alternatives

## Additional context

## Implementation

- [x] I would be interested in implementing this feature.