The re-implementation here is based on make 2 points:

• Replace expandSchema to use ref-parser library
• Replace tv4 by cfworker json schema (validator)

The selection of the validator to replace tv4, consider 2 criteria:

• Don't use eval or anything that requires changes on CSP (like unsafe-eval)
• Has the least amount of errors as possible (more important then speed)
• Is ranked on well known on benchmark tests

See: https://github.com/ebdrup/json-schema-benchmark

This refactoring includes a large set of tests and fixes for parameter field (ie: required)

This MR replaces and extends !440 (closed)