feat: add SignedTaskResponseV2

Author: uri-99

core/types/signed_task_response.go

@@ -6,6 +6,12 @@ import (
 )
 
 type SignedTaskResponse struct {
+	BatchMerkleRoot [32]byte
+	BlsSignature    bls.Signature
+	OperatorId      eigentypes.OperatorId
+}
+
+type SignedTaskResponseV2 struct {
 	BatchMerkleRoot [32]byte
 	SenderAddress [20]byte
 	BatchIdentifierHash [32]byte