feat: JSON schema for Access Evaluation Request/Response

[Oltho]

Description

Creating the json-schema 2020-12 schema for the access evaluation request and access evaluation response from the schema define at Authzen - Authorization API 1.1 - draft 01

Related issue

• Use JSON schema to describe request/response payloads #109

Additional note

1. We should consider some kind of testing to ensure that schema are compliant, as of today I'm manually validating via https://www.jsonschemavalidator.net/ and some basic example
   a. ensure minimum schema
   b. ensure the additional properties are allowed when allowed

2. The field $id should be replace with a more permanent id (eg: IANA registration ?)

3. We can reuse the schema to create an valid OAS 3.1 specs

4. We should provide guidance to people to generate "language specifics model" from json-schema or provide "authzen" own model via known platform (eg: maven)

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[ogazitt]

Good work!

[ogazitt]

@Oltho we need to ensure that you've signed an IPR agreement before we can merge this PR. Please feel free to reach out if you have one on file already.

[jogu]

We should consider some kind of testing to ensure that schema are compliant, as of today I'm manually validating via https://www.jsonschemavalidator.net/ and some basic example

https://github.com/openid/OpenID4VP?tab=readme-ov-file#running-tests and https://bitbucket.org/openid/ekyc-ida/src/master/ have tests that can check the examples in the spec comply with the schema, might be useful to consider using. It would be externalising the examples as they're currently inline in the spec.

[Oltho]

@Oltho we need to ensure that you've signed an IPR agreement before we can merge this PR. Please feel free to reach out if you have one on file already.

completed, please let me know if additional information is required