DID - Update authorization endpoint in order to support openid_credential - Authorization Code

[simpleidserver]

Documentation : https://openid.bitbucket.io/connect/openid-4-verifiable-credential-issuance-1_0.html#section-5

• Implement : If the Credential Issuer metadata contains an authorization_server parameter, the authorization detail's locations common data field MUST be set to the Credential Issuer Identifier value. : DONE
• Check grant can be updated : DONE
• Add UT to check authorization_details can be returned : DONE