Resync for data that are not enabled by default

[kderme]

tx_cbor and pool_stat is not enabled by default.
We should allow replaying the chainsync protocol just to fill in these data. This would make it easy to use the snapshots and add this options later. Initially raised at #1814

I think the best way to implement this is to add a new ConsistentLevel field, called eg ResyncExtra NewConfig. With this consistent level, only the new data will be populated.

This may have additional challenges as we haven't done much work in adapting to changes to the config. So we need to think best ways to pass the config change.