tools, benchmark: test util benchmark

Create a minimal test for the util benchmark files.

PR-URL: https://github.com/nodejs/node/pull/16050


Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>