Support adding/removing metadata Roles

[Bronstrom]

trafficstars

Description

As a catalog author, I want to add/remove Roles in regard to metadata.

Acceptance Criteria

• Additional Roles can be added
• Roles can be removed

Proposed Solution

No response

Additional Notes

No response

Implementation

• [ ] I can (or plan to) submit a pull request to implement this
• [ ] Implementing this may result in a breaking change

[brian-ruf-ezd]

Depends on #700