Create credit package

curl --request POST \
  --url https://api.gennia.ai/public/api/v1/billing/credit-packages \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "creditValueCents": 5,
  "creditsAmount": 1000,
  "extraCreditsAmount": 100,
  "name": "Starter pack",
  "renewalIntervalMonths": 1
}
'

{
  "createdAt": "2023-11-07T05:31:56Z",
  "creditValueCents": 123,
  "creditsAmount": 123,
  "extraCreditsAmount": 123,
  "name": "<string>",
  "publicId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "renewalIntervalMonths": 123,
  "updatedAt": "2023-11-07T05:31:56Z"
}