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.rs

@@ -16,6 +16,8 @@
 
 //! Macro for creating the tests for the module.
 
+#![cfg(test)]
+
 #[macro_export]
 macro_rules! decl_tests {
 	($test:ty, $ext_builder:ty, $existential_deposit:expr) => {