In SERVER-125800, we decided to use "accurate" as the qualifier to distinguish the new size/count stored in the WiredTigerRecordStore from the legacy, SizeInfo::numRecords and SizeInfo::dataSize. Accurate might be overselling our size/count, though, so we should choose a qualifier that better reflects the new size/count semantics.

As part of this change or in a follow-up, we should use the new size/count in WiredTigerRecordStore::numRecords() and WiredTigerRecordStore::dataSize(). This means defining new member functions for the old size/count.

For the minimum scope of the rename changes, see https://github.com/10gen/mongo/pull/53253/changes/3d9f36972fa85ab3c8362b7db1c6a1cd6f58290f.