[META] Add GFS deletion rotation scheme

Problem/Motivation

Since Drupal 7 there were some requests to implement logic for revision deletion similar to GFS (https://en.wikipedia.org/wiki/Backup_rotation_scheme).

The logic is very helpful for backups, but also for such kind of cleanups / deletions. Idea behind is to keep less revisions for larger time intervals. See the wikipedia issue.

I created this as meta issue, as I think several reladed / child issues could be closed if we follow this scheme.

Steps to reproduce

Proposed resolution

Either implement this as general option e.g. "Use GFS scheme" or add a setting per time interval.
Another option would be to solve it using a schedule like backup_migrate does.

Remaining tasks

User interface changes

API changes

Data model changes