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/Cargo.lock

@@ -5089,8 +5089,10 @@ dependencies = [
  "clap 3.1.6",
  "frame-benchmarking",
  "frame-benchmarking-cli",
+ "frame-system",
  "jsonrpc-core",
  "node-template-runtime",
+ "pallet-transaction-payment",
  "pallet-transaction-payment-rpc",
  "sc-basic-authorship",
  "sc-cli",
@@ -5113,6 +5115,8 @@ dependencies = [
  "sp-consensus-aura",
  "sp-core",
  "sp-finality-grandpa",
+ "sp-inherents",
+ "sp-keyring",
  "sp-runtime",
  "sp-timestamp",
  "substrate-build-script-utils",