op-chain-ops: use PoS consensus in simulated backend in deployer and genesis

[protolambda]

Description

This PR adds PoS consensus to the chain-ops package:

• For use in the simulated backend during deploying. See op-geth PR for more details. This will improve genesis preparation time.
• For use in the L1 genesis, to unblock action testing, since we can now build L1 blocks with more control (like a CL node) + latest L1 changes.

Depends on ethereum-optimism/op-geth#8
So we'll need to merge that, and update the geth reference.

Fix ENG-2755

[mergify]

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[tynes]

Looks like an old version of geth is being referenced someplace? Undefined backends.WithConsensus

edit: i see your comment

[mslipper]

LGTM. Geth PR is merged, so we can update that now.

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