List credit packages

curl --request GET \
  --url https://api.gennia.ai/public/api/v1/billing/credit-packages \
  --header 'X-Api-Key: <api-key>'

{
  "items": [
    {
      "createdAt": "2023-11-07T05:31:56Z",
      "creditValueCents": 123,
      "creditsAmount": 123,
      "extraCreditsAmount": 123,
      "name": "<string>",
      "plansUsingCount": 123,
      "publicId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "renewalIntervalMonths": 123
    }
  ],
  "limit": 123,
  "page": 123,
  "total": 123,
  "totalPages": 123
}