katana: parallelize commitment computations

[kariy]

dojo/crates/katana/core/src/backend/mod.rs

Lines 193 to 197 in da52a06

	let state_root = self.compute_new_state_root();
	let transactions_commitment = self.compute_transaction_commitment();
	let events_commitment = self.compute_event_commitment();
	let receipts_commitment = self.compute_receipt_commitment();
	let state_diff_commitment = self.compute_state_diff_commitment();

dojo/crates/katana/core/src/backend/mod.rs

Lines 228 to 231 in da52a06

	fn compute_receipt_commitment(&self) -> Felt {
	let receipt_hashes = self.receipts.iter().map(|r| r.compute_hash()).collect::<Vec<Felt>>();
	compute_merkle_root::<hash::Poseidon>(&receipt_hashes).unwrap()
	}

dojo/crates/katana/core/src/backend/mod.rs

Lines 249 to 254 in da52a06

	let mut hashes = Vec::new();
	for (tx, event) in events {
	let event_hash = event_hash(tx, event);
	hashes.push(event_hash);
	}

there are few places where we can parallelize these computations. also create a benchmark so that we can have an idea how much speed up we would get.

[Abeeujah]

Hi, Can I work on this?