Get market prices

curl --request GET \
  --url https://sandbox.axle.energy/entities/market/{market_id}/prices

{
  "timestamps": [
    "2023-11-07T05:31:56Z"
  ],
  "price_eur_per_mwh": [
    123
  ],
  "last_updated": "2024-07-11T09:28:23.183616+00:00",
  "source": "ENTSO-E"
}