feature idea: add support for jmh

[pabl0rg]

JMH seems great and it would be awesome to run benchmarks as part of a build/test process. But currently, using JMH means doing a cumbersome setup and it requires Maven 😝

I'm not sure if this should be a separate plugin or something that a test tool would support.

Also, check out what Jetbrains apparently has to live with: https://github.com/JetBrains/kotlin-benchmarks/blob/master/commands.txt