Add modernjsonschemavalidator

[michaelmior]

No description provided.

[michaelmior]

@jviotti I'm hestitant to merge this if only because it throws off the graph axes by being so much higher. I think we can keep this around and merge later. Or maybe include a way to make an implementation optional.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}