Add formater/linter

[oskardudycz]

Add formater and/or linter, e.g. Checkstyle: https://www.youtube.com/watch?v=RAC_VRj2bcM

[jkornata]

@oskardudycz If you are fine with https://github.com/google/google-java-format I can make a PR with a gradle plugin verifying it.

[oskardudycz]

@jkornata, yup, I'm fine. It'd be great if you could send such a contribution! It'd be more than welcome 🙂

[timmycam]

Hey didn't see any movement on this one so raised a quick draft PR to have a look at the style on just the distributed-processes module, not sure that some of the rules are all that great by default, but can have a look and see if there is a common workaround for some of them? eg. the lamdas.

*Update
Changed to the Palantir which makes it more readable with a longer line length.