add utility pallet (#168)

The utility pallet is required for batch transactions to work in
polkadot-js and should therefore be included in the substrate contracts
node.

See
polkadot-js/api#4801 (comment)
for details.

runtime/Cargo.toml

@@ -36,6 +36,7 @@ sp-session = { git = "https://github.com/paritytech/substrate", package = "sp-se
 sp-std = { git = "https://github.com/paritytech/substrate", package = "sp-std", default-features = false, branch = "polkadot-v0.9.34" }
 sp-transaction-pool = { git = "https://github.com/paritytech/substrate", package = "sp-transaction-pool", default-features = false, branch = "polkadot-v0.9.34" }
 sp-version = { git = "https://github.com/paritytech/substrate", package = "sp-version", default-features = false, branch = "polkadot-v0.9.34" }
+pallet-utility = { git = "https://github.com/paritytech/substrate", package = "pallet-utility", default-features = false, branch = "polkadot-v0.9.34" }
 
 # Used for the node's RPCs
 frame-system-rpc-runtime-api = { git = "https://github.com/paritytech/substrate", package = "frame-system-rpc-runtime-api", default-features = false, branch = "polkadot-v0.9.34" }

runtime/src/lib.rs

@@ -319,6 +319,13 @@ parameter_types! {
 	pub Schedule: pallet_contracts::Schedule<Runtime> = Default::default();
 }
 
+impl pallet_utility::Config for Runtime {
+	type RuntimeEvent = RuntimeEvent;
+	type RuntimeCall = RuntimeCall;
+	type PalletsOrigin = OriginCaller;
+	type WeightInfo = pallet_utility::weights::SubstrateWeight<Runtime>;
+}
+
 impl pallet_contracts::Config for Runtime {
 	type Time = Timestamp;
 	type Randomness = RandomnessCollectiveFlip;
@@ -364,6 +371,7 @@ construct_runtime!(
 		UncheckedExtrinsic = UncheckedExtrinsic,
 	{
 		System: frame_system,
+		Utility: pallet_utility,
 		RandomnessCollectiveFlip: pallet_randomness_collective_flip,
 		Timestamp: pallet_timestamp,
 		Balances: pallet_balances,