Support editing metadata revisions

[Bronstrom]

Description

As a catalog author, I want my old revisions of documents to be saved in regard to metadata.

Acceptance Criteria

• After saving a document, the previous document is saved in revisions

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

[Bronstrom]

Depends on #705