DID - Edit parameters of jwt_vc_json

[simpleidserver]

Documentation : https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#section-e.1.1

Edit following properties :

• Types : JSON array designating the types a certain credential type
• CredentialSubject : A JSON object containing a list of key value pairs, where the key identifies the claim offered in the Credential.