Get NFT traits by collection

curl --request GET \
  --url https://data-api.cloud.ormi.dev/somnia/v1/nft/collections/{address}/traits

{
  "contract_address": "<string>",
  "traits": [
    {
      "trait_type": "<string>",
      "values": [
        {
          "count": 123,
          "percentage": 123,
          "value": "<string>"
        }
      ]
    }
  ]
}