JSON Schema as separate ApiDOM namespace

[char0n]

The goal of this epic is to have JSON Schema and their various drafts and versions as separate ApiDOM namespace.

Here is the list of specification we want to support and the version of JSON Schema each of the spec is using:

• OpenAPI 2.0 - JSON Schema Draft 4
• OpenAPI 3.0.x - JSON Schema Wright Draft 00 (Draft 5)
• OpenAPI 3.1.0 - JSON Schema Draft 2020-12
• AsyncAPI 2.0.x - JSON Schema Draft 7

Draft 5 is actually a Draft 4:

You might come across references to Draft 5. There is no Draft 5 release of JSON Schema. Draft 5 refers to a no-change revision of the Draft 4 release. It does not add, remove, or change any functionality. It only updates references, makes clarifications, and fixes bugs. Draft 5 describes the Draft 4 release. If you came here looking for information about Draft 5, you'll find it under Draft 4. We no longer use the "draft" terminology to refer to patch releases to avoid this confusion.

Refs #1075 (comment)
Refs #1075

Resources:

• https://json-schema.org/specification-links.html
• Draft 6 release notes
• Draft 7 release notes
• Draft 2019-09 release notes
• Draft 2020-12 release notes
• $schema