perf(rpc): eth_getTransactionByBlock* should not fetch the whole block

[joshieDo]

Describe the feature

RPC calls such aseth_getTransactionByBlockHashAndIndex & eth_getTransactionByBlockNumberAndIndex should not need to fetch the whole block (with all transactions), just to get the one.

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

Lines 189 to 198 in b4ad28d

	fn transaction_by_block_and_tx_index(
	&self,
	block_id: BlockId,
	index: usize,
	) -> impl Future<Output = Result<Option<RpcTransaction<Self::NetworkTypes>>, Self::Error>> + Send
	where
	Self: LoadBlock,
	{
	async move {
	if let Some(block) = self.block_with_senders(block_id).await? {

Additional context

No response

[KoxyG]

Hi @joshieDo i am very interested in working on this issue. Can you pls assign me to this?