Clone schemas

[amit-kleiner]

Without the fix the test would have returned a 400 error for the second POST call. This is because running swagger mutates the schema in the global Fastify instance, and breaks the validation.
This fix clones the schema when we load it in the Fastify swagger package and prevents mutation.

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

[mcollina]

lgtm

[amit-kleiner]

fixed lint, thanks!

[climba03003]

LGTM. Below one just question.

Would it be better if we just clone it once before passing inside json-schema-resolver? I means clone at L38 / L42

[amit-kleiner]

LGTM. Below one just question.

Would it be better if we just clone it once before passing inside json-schema-resolver? I means clone at L38 / L42

It would behave the same. I can move it if you think it's better.
Also, should I bump the version to 5.1.1?

[climba03003]

It would behave the same. I can move it if you think it's better.

Yes, please.

Also, should I bump the version to 5.1.1?

I will do the release work, no need to change the version inside this PR.