Add missing map helper functions for OpAddons

[mattsse]

Describe the feature

ideally we have the same fns:

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

Lines 408 to 441 in 9089672

	/// Maps the [`EngineApiBuilder`] builder type.
	pub fn with_engine_api<T>(self, engine_api_builder: T) -> RpcAddOns<Node, EthB, EV, T> {
	let Self { hooks, eth_api_builder, engine_validator_builder, .. } = self;
	RpcAddOns { hooks, eth_api_builder, engine_validator_builder, engine_api_builder }
	}
	/// Maps the [`EngineValidatorBuilder`] builder type.
	pub fn with_engine_validator<T>(
	self,
	engine_validator_builder: T,
	) -> RpcAddOns<Node, EthB, T, EB> {
	let Self { hooks, eth_api_builder, engine_api_builder, .. } = self;
	RpcAddOns { hooks, eth_api_builder, engine_validator_builder, engine_api_builder }
	}
	/// Sets the hook that is run once the rpc server is started.
	pub fn on_rpc_started<F>(mut self, hook: F) -> Self
	where
	F: FnOnce(RpcContext<'_, Node, EthB::EthApi>, RethRpcServerHandles) -> eyre::Result<()>
	+ Send
	+ 'static,
	{
	self.hooks.set_on_rpc_started(hook);
	self
	}
	/// Sets the hook that is run to configure the rpc modules.
	pub fn extend_rpc_modules<F>(mut self, hook: F) -> Self
	where
	F: FnOnce(RpcContext<'_, Node, EthB::EthApi>) -> eyre::Result<()> + Send + 'static,
	{
	self.hooks.set_extend_rpc_modules(hook);
	self
	}

so that we can use this directly on OpAddons, instead of:

OpAddOns::default().rpc_add_ons.with_engine_api(...)

ref #16248

Additional context

No response

[Soubhik-10]

Can I take this?