* op-node: split l1 source into eth and l1 client

* op-node: fix comment typo
Co-authored-by: Javed Khan <javed@optimism.io>

* op-node: implement l1 rpc review suggestions
Co-authored-by: Javed Khan <javed@optimism.io>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>