Support data files in jmh benchmarks

[ghost]

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[ghost]

@johnynek feel free to make a copy of this PR, as I'm waiting for our legal department to sign off my contribution - it might be faster if you merge a copy.

[johnynek]

Thanks for the PR!

I am on vacation today and will merge tomorrow if the CLA has been signed by then.

Thanks again.

[ghost]

I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[johnynek]

Thanks again!

[ghost]

Thank you for the quick turnaround :)