Integrate Engine2 for Optimism

[mattsse]

for eth we already have:

reth/crates/ethereum/node/src/launch.rs

Line 42 in 4107df8

pub struct EthNodeLauncher {

we need the same for optimism

maybe there's a way to make the setup reusable for OP by modifying:

reth/crates/ethereum/engine/src/service.rs

Lines 46 to 52 in 4107df8

	pub struct EthService<DB, Client>
	where
	DB: Database + 'static,
	Client: BlockClient + 'static,
	{
	orchestrator: EthServiceType<DB, Client>,
	}

but optional for now

TODO

• make it possible to launch OP with new engine, same as:

reth/bin/reth/src/main.rs

Lines 37 to 39 in 4107df8

	if let Err(err) = Cli::<EngineArgs>::parse().run(|builder, engine_args| async move {
	let enable_engine2 = engine_args.experimental;
	match enable_engine2 {