Skeleton for nv30 to support development and testing #13889

Write the skeleton for nv30. This is part of a series of tickets across multiple repos, as building up a network upgrade skeleton requires changes across:

• Skeleton for nv30 to support development and testing ref-fvm#2347
• Skeleton for nv30 to support development and testing filecoin-ffi#590
• Skeleton for nv30 to support development and testing go-state-types#472
• lotus (this ticket)

How to create a network skeleton in Lotus is documented here: https://github.com/filecoin-project/lotus/blob/master/documentation/misc/Building_a_network_skeleton.md#lotus-checklist

Done Criteria

• There is a network skeleton in Lotus, which bubbles up all the other dependencies, and allows one to run a 2k-network and see that it switches network version from nv29 to nv30.

User/Customer

Implementers