feat(stages): remove static files stage, run before loop

[shekhirin]

StaticFile stage doesn't fit well into the pipeline abstraction, because the expectation is that Headers executes first, converting the target block hash into the target block number, and all consequent stages execute on top of Headers stage checkpoint.

Instead, we run the StaticFileProducer before main pipeline loop to ensure that all data are copied from MDBX to static files, so the pipeline stages like Headers, Bodies and Execution could write directly to them.

h/t @rkrasiuk for the idea

[rkrasiuk]

great

[gakonst]

would like to improve the builder pattern here such that we don't have 3 mentions of provider factory in the call -- not a blocker

[shekhirin]

it's a bit of an unreal example because of debug cmd. in practice, it looks like this

reth/crates/node-builder/src/builder.rs

Lines 359 to 364 in 0a6e95c

	// configure static_file_producer
	let static_file_producer = reth_static_file::StaticFileProducer::new(
	provider_factory.clone(),
	provider_factory.static_file_provider(),
	config.prune_config()?.unwrap_or_default().segments,
	);

reth/crates/node-core/src/node_config.rs

Line 890 in a1df62c

.build(provider_factory, static_file_producer);

but I agree that we can pass only provider_factory and prune_modes inside the StaticFileProducer::new