add loadedAccountsDataSize to simulate transaction response

packages/errors/src/json-rpc-error.ts

@@ -90,6 +90,7 @@
         programId: string;
     } | null;
     unitsConsumed: number | null;
+    loadedAccountsDataSize: number | null;
 }
 
 export function getSolanaErrorFromJsonRpcError(putativeErrorResponse: unknown): SolanaError {

packages/rpc-api/src/simulateTransaction.ts

@@ -117,6 +117,8 @@ type SimulateTransactionApiResponseBase = Readonly<{
     }> | null;
     /** The number of compute budget units consumed during the processing of this transaction */
     unitsConsumed?: bigint;
+    /** The number of bytes of all accounts loaded by this transaction */
+    loadedAccountsDataSize?: bigint;
 }>;
 
 type SimulateTransactionApiResponseWithAccounts<T extends AccountInfoBase> = Readonly<{