title: Keycloak User Roles missing in REST API
body: <p>I would like to ask, if somebody knows, why there are <strong>no roles</strong> within the user details in REST ADMIN API request. I saw some posts dealing with this topic, but there were either no clear answer or they propose to use keycloak-admin-client, but that seems not very convenient. Maybe I need to map the roles in Admin console or use claims? Roles are one of the most important user attribute so whats the reason they are not retrieved as other user attributes?Any suggestion? Thanks</p>
  
  <pre><code>GET /auth/admin/realms/{realm}/users 
  
  {
    "id": "efa7e6c0-139f-44d8-baa8-10822ed2a9c1",
    "createdTimestamp": 1516707328588,
    "username": "testuser",
    "enabled": true,
    "totp": false,
    "emailVerified": false,
    "firstName": "Test",
    "lastName": "User",
    "email": "test@xxx.com",
    "attributes": {"xxx": ["123456"]},
    "disableableCredentialTypes": ["password"],
    "requiredActions": []
  }
  </code></pre>