Get all sites

curl --request GET \
  --url http://localhost:8002/entities/site \
  --header 'Authorization: Bearer <token>'

{
  "sites": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "mpan": "<string>",
      "postcode": "<string>",
      "address": "<string>",
      "asset_ids": [],
      "markets": [
        "cm"
      ],
      "tariff": {
        "tariff_type": "single_rate",
        "tariff_cheap_start_time": "<string>",
        "tariff_cheap_end_time": "<string>"
      }
    }
  ],
  "total_num_sites": 123,
  "total_num_pages": 123,
  "page_number": 123
}