Benchmark Utility Pallet (#5384)

* Move tests

* Move around feature cfgs

* Start benchmarks

* as_multi bench

* finish

* fix tests

* Update frame/utility/src/benchmarking.rs

Co-Authored-By: Marcio Diaz <marcio.diaz@gmail.com>

* Update Cargo.toml

* fix test

Co-authored-by: Marcio Diaz <marcio.diaz@gmail.com>

substrate/frame/balances/src/tests_composite.rs

@@ -16,6 +16,8 @@
 
 //! Test utilities
 
+#![cfg(test)]
+
 use sp_runtime::{Perbill, traits::{ConvertInto, IdentityLookup}, testing::Header};
 use sp_core::H256;
 use sp_io;