[Feature] Recirculation - sort pebbles into regions, update history

[ZoeRichter]

Part of the process of recirculating pebbles is checking for their regions and updating their positional histories.

Describe the feature you'd like.

Part of recirculating the pebbles is that their regions may change. Their current region ID will need to be updated, and their positional history will need to be updated to include that region. There may be two histories - one for the region at each time step, and one that ignores the time spent in each region. For example, if a pebble spent 1, 2, and 3 sim-steps in regions A, B, and C respectively, the long-history would read [A, B, B, C, C, C], while the short list would only read [A, B, C]. Both may be necessary to explore the fidelity of the fuel isotopics modeled - so it's probably better to make sure you have that now, just in case.

Additional context.

This issue is part of the recirculation issues.

How can this issue be closed?

This issue can be closed with a PR that adds this functionality.