Post Revisions CRUD

[dcalhoun]

We plan to interact with post revisions by communicating with a site's REST API directly. Thus, we need support for Post Revisions endpoints.

[dcalhoun]

This issue was created to allow other teams to follow the progress of this work: p1738855448218909/1728980272.371139-slack-C0180B5PRJ4. Please feel free to modify or replace this issue, if desired.