Create step-up config

curl --request POST \
  --url https://api.prelude.dev/v2/session/apps/{appID}/config/stepup \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "step_keys": [
    {
      "key": "<string>",
      "description": "<string>"
    }
  ],
  "allowed_scopes": [
    {
      "scope": "<string>"
    }
  ],
  "jwks_url": "<string>"
}
'

{
  "config": {
    "jwks_url": "<string>",
    "step_keys": [
      {
        "key": "<string>",
        "description": "<string>"
      }
    ],
    "allowed_scopes": [
      {
        "scope": "<string>",
        "delegated": {
          "delegation_hook": "<string>"
        },
        "direct": {
          "identifier_types": [],
          "granted_for": 43200,
          "steps": [
            {
              "order": 2,
              "key": "<string>",
              "expiration_duration": 43200
            }
          ]
        }
      }
    ],
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  }
}