fix: standalone ajv schema

[climba03003]

This PR do not need to merge immediately.
We need to test each edge case before merging this PR.

1. It remove fast-json-stringify in standalone code.
2. It address the issue of fast-json-stringify generate custom json schema.
3. It update the types.

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

[climba03003]

Given that people complain fastify/fastify#3998 it about the fast-json-stringify/serialize apporach.
I see the point of @ivan-tymoshenko is absolutely right.

This patch will remove the dependent of fast-json-stringify internal files.

[mcollina]

Good work, one nit

[mcollina]

lmk when it's ok to release

[ivan-tymoshenko]

@climba03003 Do we need to generate a standalone serializer only here?
https://github.com/fastify/fastify/blob/main/build/build-error-serializer.js

[mcollina]

I would not exclude we could need to do it elsewhere too.

[climba03003]

@mcollina
I think it is ok to land now.
One final tweak is that it should not write ajv to standalone script when it is not needed.

[mcollina]

@climba03003 could you send the PRs needed to fastify and https://github.com/fastify/fast-json-stringify-compiler? Please update the versions everywhere.