@tbroyer Thank you very much for your contribution!

The only thing I'm questioning is, given how many parameters GoogleJavaFormatStep::create has now, if we'd benefit from replacing its new variation with a builder. @tbroyer @nedtwigg What do you think?

If we decide the answer is "no", then I wonder if it would be best for the boolean parameter to come before the Provisioner, as provisioners are a Spotless concept, and moving it to the right of the other parameters might be easiest to understand.

Other than that, this PR LGTM, so well done and thanks again!