Transform v3 schema to a more compatible W3C compliant schema

[Nebulis]

Current Behavior

V3 schema and W3C have some differences which forces us to have a function to map an OA document to a W3C valid document.

The problem is that if we release V3 like this, we will have to support both document, which will be harder to handle.

Expected behavior

V3 schema MUST be W3C compatible

Proposal

• reference is not a mandatory field
• name is not a mandatory field
• validFrom is not a mandatory field
• attachments to be renamed to evidence
• evidence may have an id
• identityProof must be in proof object (issuer can be a string, and in that case it may cause trouble)
• identityProof to be renamed to identity (being in proof property, the name identityProof sounds a bit redundant)
• issuer can be a string

[gjj]

Leaving this here for future reference on having multiple issuers of an OA v3 document: https://github.com/w3c/vc-data-model/issues/741

  ...
  "issuer": {
      "id": "... url to a 'joint partnership' page, or a urn id that's a hash of the participants...",
      "name": "University of A, The Royal College of B",
      "participant": [
         "https://universityA.edu",
         "did:web:royalcollegeofb.edu"
      ]
   }
  ...