curl --request GET \
  --url https://api.unprice.dev/v1/features/list \
  --header 'Authorization: Bearer <token>'

{
  "features": [
    {
      "id": "<string>",
      "projectId": "<string>",
      "slug": "<string>",
      "code": 123,
      "unitOfMeasure": "<string>",
      "title": "<string>",
      "description": "<string>",
      "meterConfig": {
        "eventId": "<string>",
        "eventSlug": "<string>",
        "aggregationField": "<string>",
        "filters": {},
        "groupBy": [
          "<string>"
        ]
      }
    }
  ]
}