Sub-commands for benchmark (#11164)

* Restructure benchmark commands

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add benchmark block test

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fixup imports

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* CI

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Review fixes

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Extend error message

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Apply suggestions from code review

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

* Review fixes

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add commands to node-template

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

substrate/bin/node-template/runtime/src/lib.rs

@@ -33,6 +33,7 @@ pub use frame_support::{
 	},
 	StorageValue,
 };
+pub use frame_system::Call as SystemCall;
 pub use pallet_balances::Call as BalancesCall;
 pub use pallet_timestamp::Call as TimestampCall;
 use pallet_transaction_payment::CurrencyAdapter;
@@ -306,6 +307,8 @@ pub type SignedExtra = (
 );
 /// Unchecked extrinsic type as expected by this runtime.
 pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// The payload being signed in transactions.
+pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;
 /// Executive: handles dispatch to the various modules.
 pub type Executive = frame_executive::Executive<
 	Runtime,