It would be useful to have a mechanism in WiredTiger that identified when leaf pages don't have much content, and combined them together. That would mean that we can create more efficient tree structures.

The functionality could be linked in with the WT_SESSION::compact API, or just part of normal operation. The goal of this ticket is to describe how pages can be combined back together, not necessarily how to do that in a running database.

This is particularly relevant if WT-10832 turns out to be an issue with reconciliation creating leaf pages with an inefficiently small amount of content.