Revisions: add a way to share and preview a specific revision

[annezazu]

In line with feedback and plans for a public preview, I recently heard feedback about sharing a preview of a revision as part of a workflow. For example, writing a post and wanting to share the revision with legal or editorial to confirm it's all set. As another example, imagine building a site for a client and wanting to share a version with them early for feedback. This feels different but related to a public preview link that folks could use to preview and leave comments on a post as it would inherently break out a specific revision for comments.

I'm not sure if this is plugin territory or if it's just a matter of configuring things to consider this use case but wanted to note it as it's come up a few times as workflow feedback when talking with enterprise folks.