Feature request: API endpoint to import historical revisions

The ZIP import works well for a once-off wiki import but it lacks the ability to import revisions.

Using the API it could be possible to import an entire wiki including all revisions. Initially I tried the existing endpoint documents.update but discovered two problems:
1. it does not have a method to set a historical date for the update (related #11416)
2. the revisions are 'debounced' by the system after import, and so end up as a single revision.

The feature I propose is a new endpoint revisions.create:
• it accepts the same API fields as documents.update
• it does not do any publish actions
• it does not run any debounce based on revision creation time