Get pool of registered assets for market

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

{
  "id": "<string>",
  "market_id": "<string>",
  "assets": [
    {
      "id": "<string>",
      "type": "Vehicle",
      "bidding_zone": "DE_TENNET",
      "alias": "<string>"
    }
  ],
  "qualifies": true,
  "is_qualified": true,
  "available_flex": {
    "timestamps": [
      "2023-11-07T05:31:56Z"
    ],
    "expected_value_kw": [
      123
    ]
  },
  "bids": [
    {
      "from_level_mw": 123,
      "to_level_mw": 123,
      "price_eur": 123,
      "from_time": "2023-11-07T05:31:56Z",
      "to_time": "2023-11-07T05:31:56Z",
      "id": "<string>",
      "submitted": false
    }
  ]
}