Negative test cases for the JSO/CDDL schema

[akeranen]

We should have a few models we know are broken in certain ways and make sure the schema catches the errors.

[cabo]

can also use cddl ... g to generate examples.

[akeranen]

Tools support for this here: https://github.com/one-data-model/tools/blob/cddl-tests/sdflint/tests/README.md