Added more fields to the error struct

[bogdanprodan-okta]

1. Error from the response body

{
 "error": "consent_required",
 "error_description": "You are not allowed any of the requested scopes."
}

2. Error from the response header

Www-Authenticate: Bearer authorization_uri="http://example.com/oauth2/v1/authorize", realm="http://example.com", scope="okta.roles.read", error="insufficient_scope", error_description="The access token provided does not contain the required scopes.", resource="/api/v1/groups/groupID/roles"