feat(starknet_batcher): add l2 gas used to decision_reached (#2950)

crates/starknet_batcher/src/batcher.rs

@@ -423,7 +423,10 @@ impl Batcher {
             block_execution_artifacts.tx_hashes(),
         )
         .await?;
-        Ok(DecisionReachedResponse { state_diff })
+        Ok(DecisionReachedResponse {
+            state_diff,
+            l2_gas_used: block_execution_artifacts.l2_gas_used,
+        })
     }
 
     async fn commit_proposal_and_block(

crates/starknet_batcher/src/batcher_test.rs

@@ -571,6 +571,7 @@ async fn decision_reached() {
     let response =
         batcher.decision_reached(DecisionReachedInput { proposal_id: PROPOSAL_ID }).await.unwrap();
     assert_eq!(response.state_diff, expected_artifacts.state_diff());
+    assert_eq!(response.l2_gas_used, expected_artifacts.l2_gas_used);
 }
 
 #[rstest]

crates/starknet_batcher_types/src/batcher_types.rs

@@ -5,6 +5,7 @@ use serde::{Deserialize, Serialize};
 use starknet_api::block::{BlockHashAndNumber, BlockInfo, BlockNumber};
 use starknet_api::core::StateDiffCommitment;
 use starknet_api::executable_transaction::Transaction;
+use starknet_api::execution_resources::GasAmount;
 use starknet_api::state::ThinStateDiff;
 
 use crate::errors::BatcherError;
@@ -92,6 +93,7 @@ pub struct SendProposalContentResponse {
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
 pub struct DecisionReachedResponse {
     pub state_diff: ThinStateDiff,
+    pub l2_gas_used: GasAmount,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]