[Openid-specs-ab] Issue #1592: using credential_type as a key in issuer metadata. (openid/connect)

[Kristina Yasuda]

New issue 1592: using credential_type as a key in issuer metadata.
https://bitbucket.org/openid/connect/issues/1592/using-credential_type-as-a-key-in-issuer

Kristina Yasuda:

Opening an issue because there is no corresponding one to a change being made in a PR #240.

It removes an identifier used as a key in the `credentials_supported` object and the types inside formats object, and insted uses type \(also used in scopes\) as a key in the `credentials_supported` object.

From below 

```json
{
  "credentials_supported": {
    "university_degree": {
       "formats": {
          "ldp_vc": {
              "types": ["VerifiableCredential", "UniversityDegreeCredential"]
          }
       }
     }
  }
}
```

to

```json
{
  "UniversityDegreeCredential": {
    "university_degree": {
       "formats": {
          "ldp_vc": {
          }
       }
     }
  }
}
```

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