Improve eth_gasPrice basefee lookup

[mattsse]

Describe the feature

currently, this fetches the entire block:

reth/crates/rpc/rpc-eth-api/src/helpers/fee.rs

Line 338 in 4686778

let header = self.recovered_block(BlockNumberOrTag::Latest.into());

but we only need the most recent header which we could fethc from

reth/crates/storage/storage-api/src/block.rs

Lines 304 to 310 in 4686778

	/// Returns the latest block header if available
	///
	/// Note: This returns a [`SealedHeader`] because it's expected that this is sealed by the
	/// provider and the caller does not know the hash.
	fn latest_header(&self) -> ProviderResult<Option<SealedHeader<Self::Header>>> {
	self.sealed_header_by_id(BlockNumberOrTag::Latest.into())
	}

but the trait bounds currently only require BlockReader

reth/crates/rpc/rpc-eth-api/src/node.rs

Line 84 in 4686778

pub trait RpcNodeCoreExt: RpcNodeCore<Provider: BlockReader> {

but we need BlockReaderIdExt for this

TODO

• extend the Provider bound in LoadFee trait to BlockReaderIdExt
• use latest_header for fetching the fee

we could maybe even bump the trait bound here entirely:

reth/crates/rpc/rpc-eth-api/src/node.rs

Line 84 in 4686778

pub trait RpcNodeCoreExt: RpcNodeCore<Provider: BlockReader> {

which is maybe easier long term but more invasive

Additional context

No response

[SkandaBhat]

can look into this