List add-on entitlements

Example response

{
  "data": [
    {
      "feature": {
        "id": "feat_7n42DGM5Tflk9n8mt7Fhc7",
        "product": {
          "id": "prd_7n42DGM5Tflk9n8mt7Fhc7"
        }
      },
      "value": {
        "metric_id": "bm_7n42DGM5Tflk9n8mt7Fhc7"
      }
    }
  ]
}