Tracking: RPC Simplifications

[jenpaff]

We should make it easier to work with and customize the EthApi. Right now it takes 4 generics all of which are available on FullNodeComponents trait:

reth/crates/rpc/rpc/src/eth/core.rs

Line 63 in 73ffe36

pub struct EthApi<Provider: BlockReader, Pool, Network, EvmConfig> {

Ideally we want it to simply take a single N: FullNodeComponents generic so that all of the node configuration and, more importantly, bounds on components are available directly on it, allowing to remove e.g those bounds:

reth/crates/optimism/rpc/src/eth/mod.rs

Lines 251 to 259 in 73ffe36

	+ LoadState<
	Evm: ConfigureEvm<
	Primitives: NodePrimitives<
	BlockHeader = ProviderHeader<Self::Provider>,
	SignedTx = ProviderTx<Self::Provider>,
	>,
	>,
	Error: FromEvmError<Self::Evm>,
	>,

This would break APIs around RpcModuleBuilder:

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

Lines 299 to 320 in 73ffe36

	///
	/// This is the main entrypoint and the easiest way to configure an RPC server.
	#[derive(Debug, Clone)]
	pub struct RpcModuleBuilder<N, Provider, Pool, Network, Tasks, EvmConfig, BlockExecutor, Consensus>
	{
	/// The Provider type to when creating all rpc handlers
	provider: Provider,
	/// The Pool type to when creating all rpc handlers
	pool: Pool,
	/// The Network type to when creating all rpc handlers
	network: Network,
	/// How additional tasks are spawned, for example in the eth pubsub namespace
	executor: Tasks,
	/// Defines how the EVM should be configured before execution.
	evm_config: EvmConfig,
	/// The provider for getting a block executor that executes blocks
	block_executor: BlockExecutor,
	/// The consensus implementation.
	consensus: Consensus,
	/// Node data primitives.
	_primitives: PhantomData<N>,
	}

It's primary usecase is to allow setting up EthApi without a full launched node in the same process by configuring mocks for components that are not available/needed:

reth/examples/rpc-db/src/main.rs

Lines 68 to 72 in 73ffe36

	let rpc_builder = RpcModuleBuilder::default()
	.with_provider(provider.clone())
	// Rest is just noops that do nothing
	.with_noop_pool()
	.with_noop_network()

We can fix those by introducing a helper FullNodeComponentsBuilder which would be a similar helper constructing FullNodeComponents instead which might be useful even outisde of RPC