Benchmark Vesting (#5048)

* Init macro

* Refactor function.

* Add feature

* vested transfer benchmark

* Fix features

* Forgot to push this fix

* bump impl

* Nits.

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/bin/node/runtime/Cargo.toml

@@ -137,4 +137,5 @@ runtime-benchmarks = [
 	"pallet-timestamp/runtime-benchmarks",
 	"pallet-identity/runtime-benchmarks",
 	"pallet-balances/runtime-benchmarks",
+	"pallet-vesting/runtime-benchmarks",
 ]