Add a helper NetworkBuilder that allows overriding certain settings

[mattsse]

Describe the feature

the NetworkBuilder is responsible for building the network instance:

reth/crates/optimism/node/src/node.rs

Lines 330 to 339 in 72865f1

	impl<Node, Pool> NetworkBuilder<Node, Pool> for OptimismNetworkBuilder
	where
	Node: FullNodeTypes<Types: NodeTypes<ChainSpec = OpChainSpec>>,
	Pool: TransactionPool + Unpin + 'static,
	{
	async fn build_network(
	self,
	ctx: &BuilderContext<Node>,
	pool: Pool,
	) -> eyre::Result<NetworkHandle> {

currently we don't have an easy way to simply override certain settings, e.g. in config.

A helper type that contains certain settings of NetworkArgs would be beneficial here, without having to reimplement the entire thing.

Additional context

paradigmxyz/alphanet#134

FYI @onbjerg

No response

[onbjerg]

Is this resolved in #11506 and #11507 or is there more left?