Fix/Added decoding of credentials_supported key to parsing.

[marcelsalej]

Description of change

When testing walletKit on main branches, I noticed that issuing a PID or MDL stopped working.

Tested with EUDI demo issuer: https://issuer.eudiw.dev/oidc

Issue was that wrong key was provided based on issuer response:

{
  "credential_endpoint": "https://issuer.eudiw.dev/oidc/credential",
  "credential_issuer": "https://issuer.eudiw.dev/oidc",
  "credentials_supported": {
    "eu.europa.ec.eudiw.mdl_jwt_vc_json": {
      "credential_definition": {
        "credentialSubject": {
          "administrative_number": {
            "display": [
              {
                "locale": "en",
                "name": "An audit control number assigned by the issuing authority"
              }
            ],
            "mandatory": false
          }

Now app tries to decode credential_configurations_supported first. If this fails it will try to decode also credentials_supported

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] Parameter credentials_supported now decodes as it should

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the readme
• [x] My changes generate no new warnings
• [x] I have added unit tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[dtsiflit]

Hello @marcelsalej, thank you for your PR! We removed credentials_supported according to draft 13 of the specification. This change is not part of the issuer (https://issuer.eudiw.dev/oidc) yet. I will make a comment here when the issuer supports draft 13.

Meanwhile, can you please check https://dev.issuer.eudiw.dev/? This does support draft 13 in this library.

[dtsiflit]

The issuer (https://issuer.eudiw.dev) now supports draft 13. There is no need to support credentials_supported. Thanks @marcelsalej I'll close this issue now.