op-node: split driver state/model into L1 state, L1 origin selector, L2 sequencer, L2 derivation

[protolambda]

Description

TLDR of driver refactor design doc:

• Driver should not mix state with event handling so much. Separate with interfaces for testing instead.
• Sequencing needs to be separated as a model, if we want to test it separate from the event handling, like in action-testing
• L1 origin selection can be tricky, separating it will enable us to unit test it

Changes:

• No more Driver struct { state } that proxies all calls. We just define a Driver struct.
• Separate L1 head/safe/finalized, with handling funcs, from driver state
• Separate L1 origin finding from driver state
• Separate sequencing from driver state, and deprecate the all-in-one-go sequencing in favor of a two-step process which we can adopt later, to enable the sequencer to build the best blocks and maybe even respond to reorgs before completing a block.
• Cleaned up unused arg in Start function

Tests

No functionality changed, it's rewiring to make testing much more viable. In the L2 sequencer action-testing PR I plan to plug in all these state components (origin selection, l1 state, sequencing). We can wait with this PR if we're unsure.

Metadata

Fix ENG-2864

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[mergify]

This PR changes implementation code, but doesn't include a changeset. Did you forget to add one?

[trianglesphere]

The biggest thing is that I don't think we're ready to migrate over to the start/complete block building process, but it is good that we're setting it up to go that way.

[mergify]

Hey @protolambda! This PR has merge conflicts. Please fix them before continuing review.

[protolambda]

Will rebase to fix merge conflicts, and include the deadlock fix

[trianglesphere]

nice work, every looks great

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

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