Add helper function to replace one rpc function

[mattsse]

Describe the feature

we already have:

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

Line 1868 in d5ddb41

pub fn remove_method_from_configured(&mut self, method_name: &'static str) -> bool {

and

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

Lines 1809 to 1812 in d5ddb41

	pub fn merge_configured(
	&mut self,
	other: impl Into<Methods>,
	) -> Result<(), RegisterMethodError> {

a nice use case is to replace one specific function, so we'd like to have something like

fn replace_configured(&mut self, impl Into<Methods>)

the method name to remove we get from Methods::method_names

we also want this for individual transports ws,HTTP,ipc

Additional context

No response

[varun-doshi]

I can take this one