Support OpenAPI 3.1

[horiuchi]

Prerequisites for support OpenAPI 3.1
https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md

• Support JSON Schema 2020-12
  https://json-schema.org/draft/2020-12/release-notes.html
  https://json-schema.org/draft/2019-09/release-notes.html
  • Support some new properties
  • Support $dynamicRef and $dynamicAnchor