Introduce option to log/output valid files with `jsonschema validate`

[TobiasNx]

If I am not mistaken only errors can be logged while valid results are not logged and create no output.
Would be great to introduce an option that can log these similar to ajv test --valid

[jviotti]

Hey @TobiasNx ,

Did you try --verbose? Though at the moment it would also print annotation, which might be too much...

Let me know how that feels. Maybe there is some improvements we could do on top of that. Like printing every ok / error on --verbose while keeping annotations out using --annotations or something like that.