Strip external schemas from standalone compiled code

[remidewitte]

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[ivan-tymoshenko]

I see that this is a serialized state, but can you check if validator still works after this change. You need to use oneOf/anyOf keywords in the external schemas to trigger the validator usage.

[remidewitte]

Thanks for the feedback. I will check the oneOf/anyOf use case.

[remidewitte]

I can now confirm with a proper test case that it works with the oneOf case / validator case.
The standalone code does not need to keep external schemas as validatorState will hold them if the validator needs them.

[mcollina]

lgtm