feat: add getL1MessageByIndex rpc method

[frisitano]

Overview

This PR adds a method that allows the user to fetch a L1 message by its index. This method intentionally returns the L1MessageEnvelope which wraps the raw transaction and includes additional metadata. We should confirm if its desireable to return the L1MessageEnvelope instead of the internal TxL1Message.

rollup-node/crates/primitives/src/transaction.rs

Lines 4 to 15 in 243b212

	/// A L1 message envelope, containing extra information about the message.
	#[derive(Debug, Clone, PartialEq, Eq)]
	pub struct L1MessageEnvelope {
	/// The L1 transaction.
	pub transaction: TxL1Message,
	/// The L1 block number at which the L1 message was generated.
	pub l1_block_number: u64,
	/// The L2 block number at which the L1 message was processed.
	pub l2_block_number: Option<u64>,
	/// The queue hash for the message.
	pub queue_hash: Option<B256>,
	}

This has been implemented by introducing the DatabaseQuery command variant and a DatabaseQuery enum such that this pattern can be extended easily to perform other database lookups.

[codspeed-hq]

CodSpeed Performance Report

Merging #370 will not alter performance

_{Comparing feat/get_l1_message_by_index_rpc (3f009df) with main (15c4b3b)}

Summary

✅ 2 untouched

[greged93]

lgtm, just a suggestion on implementing get_l1_message