Implement fip 0059

[jennijuju]

https://github.com/filecoin-project/FIPs/blob/master/FIPS/fip-0059.md

target branch: feat/sytheticporep

add v12 types, which will be identical to v11 atm other than the new proof types

• [ ]see how to add a new actor type here https://github.com/filecoin-project/go-state-types/pull/170/files
• [ ]add new proof type in https://github.com/filecoin-project/go-state-types/blob/master/abi/sector.go
• [ ]add its policy in https://github.com/filecoin-project/go-state-types/blob/master/builtin/sector.go

Introduce the new network version:

• barebone v12 migration (no state migration other actor cid): see #136
• add network version https://github.com/filecoin-project/go-state-types/blob/master/network/version.go