claims description mixes display and schema information

[c2bo]

Claims description in the metadata is introduced as

A claims description object as used in the Credential Issuer metadata is an
object used to describe how a certain claim in the Credential should be
displayed to the End-User. It is used in the claims
parameter in the Credential Issuer metadata defined in (#format-profiles).

It however seems to contain information that goes more into the realm of schema definitions with

• value_type which denotes the type of a value (removed in the last PR)
• claim description that does not contain display - which basically seems to be a signal that this claim exists in the specific credential (especially for claims that are optional in their credential schema)

example for the second part:

...
        {
          "path": ["address"],
          "display": [
            {
              "name": "Place of residence",
              "locale": "en-US"
            },
            {
              "name": "Wohnsitz",
              "locale": "de-DE"
            }
          ]
        },
        {"path": ["address", "street_address"]},
        {"path": ["address", "locality"]},
        {"path": ["address", "region"]},
...

I am not convinced we need both currently as all major credential formats seem to have their own mechanism to convey schema:

• namespace for mdoc
• vct for sd-jwt
• context for w3c vcdm

To me, it feels like both mechanisms are either under-specified or not entirely necessary & seem to duplicate the schema information of the credential formats.