Enable discv5 for op in reth-node-optimism crate

[emhane]

Describe the feature

Move network specific logic that enables discv5 for an op network into reth-node-optimism crate.

reth/crates/node-core/src/args/network.rs

Lines 171 to 174 in 072d422

	if chain_spec.is_optimism() && !self.discovery.disable_discovery {
	network_config_builder =
	network_config_builder.discovery_v5(reth_discv5::Config::builder(rlpx_socket));
	}

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

Line 469 in 072d422

.disable_discv4_discovery_if(self.chain.chain.is_optimism())

Additional context

No response

[qiweiii]

can i take this?

[mattsse]

sure

we can configure this in the OP network builder:

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

Line 272 in 977def8

let mut network_config = ctx.network_config()?;

[qiweiii]

@mattsse @emhane please check if the pr changes are the expected solution