Install missing eth_ handlers if eth module is selected

[mattsse]

Describe the feature

with #1267 we now have EthPubSub and EthFilter handlers for the eth namespace, which are currently not installed if the eth module is selected.

TODO

install all eth handlers.

Currently only the EthApi handler is installed

reth/crates/rpc/rpc-builder/src/lib.rs

Line 400 in a58cf8a

RethRpcModule::Eth => self.eth_api().into_rpc().into(),

if we add multiple handlers per namespace, this will break the reth_methods function because now we need to return multiple Methods.

we should refactor this:

reth/crates/rpc/rpc-builder/src/lib.rs

Lines 379 to 390 in a58cf8a

	for reth_module in config.iter_selection() {
	let methods = self.reth_methods(reth_module);
	module.merge(methods).expect("No conflicts");
	}
	module
	}
	/// Returns the [Methods] for the given [RethRpcModule]
	///
	/// If this is the first time the namespace is requested, a new instance of API implementation
	/// will be created.
	pub fn reth_methods(&mut self, namespace: RethRpcModule) -> Methods {

so that reth_methods takes impl Iterator<RethRpcModule> and returns a Vec<Methods> instead.

cc @leruaa

Additional context

No response

[leruaa]

I can work on this :)