The stats program needs to support changes and improvements from on-the-fly introduced by Cadence:

• Combine domain payloads and provide on-the-fly migration cadence#3664

In addition to domain registers, there will be account register created after PR 3664 is deployed using HCU.

We can update checkpoint-collect-stats util command to gather some stats on new account registers.

Updating the stats program will help us track progress.

NOTE: The improvements in PR 3664 and its on-the-fly migration will only improve accounts that have write ops (it won't affect idle or read-only accounts).