op-batcher: Split batch_submitter.go into several files

[trianglesphere]

Description

This simply moves code around into new files without changing it. The intention is to tease it apart, but that is not done yet.

Tests

Still passing, this simply moves code around.

Additional context

This is part of updating the batcher & I've already started follow up work to clean this up even more. I'm happy to incorporate comments into follow up work, but I will likely be changing a lot of this code.

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Latest commit: 47e58e4

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[mergify]

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

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