Bean validation integration

[Azquelt]

• Schema enhanced by certain bean validation annotations
• Can be overridden by user
• Can be disabled by config

Fixes #482

[Azquelt]

There's a commit to autoformat the code before my changes, since maven does this on every build. I must have forgotten to run a full build before my last PR

[Azquelt]

I haven't quite got all of these passing on the smallrye impl yet but will work on that tomorrow.

[Azquelt]

Updated because I'd been reading the wrong draft version of json schema when I was writing the tests.