🎯 | B3-M2: Rebase Lotus with FVM integration

[jsoares]

For work tracking purposes.

Refer to the parent project issue for high-level discussion and resources.

[adlrocha]

See filecoin-project/eudico#216, it would be ideal if we can wait for FVM-M2 to be part of lotus master to avoid having to maintain several forks (and forks-of-forks). However, if the dates for this keeps slipping, we may choose to do so and not rebase our forks until this happens and then adapt our integration so we can make progress in the meantime without a lot of overhead.

[jsoares]

Closing in favour of new, more granular milestones.