- ability to extract a tipset range into individual vectors.
- ability to extract a tipset range and squash into a single multi-tipset vector.
- mark statediff output deterministically, so it can be extracted by tooling.
- ability to execute callbacks between tipsets in the driver.
- implement save-balances callback.
This PR introduces support for running multiple variants of a vector,
each of which targets a unique protocol version.
tvx tooling has been adapted to produce and parse the new version
of the schema.
