Included new fields

We've added 'user_favorites_count', and 'ath' (all-time-high) related data to the following NFT endpoints:

/nfts/{id}
/nfts/{asset_platform_id}/contract/{contract_address}

Example of responses:

{
  "user_favorites_count": 3660,
  "ath": {
    "native_currency": 22.9,
    "usd": 67535
  },
  "ath_change_percentage": {
    "native_currency": -59.825327510917,
    "usd": -64.3396788440525
  },
  "ath_date": {
    "native_currency": "2024-02-17T09:25:05.056Z",
    "usd": "2024-02-29T11:45:08.150Z"
}