List Futures Positions

curl --request GET \
  --url https://api.coinbase.com/api/v3/brokerage/cfm/positions

{
  "positions": [
    {
      "product_id": "<string>",
      "expiration_time": "<string>",
      "side": "<any>",
      "number_of_contracts": "<string>",
      "current_price": "<string>",
      "avg_entry_price": "<string>",
      "unrealized_pnl": "<string>",
      "daily_realized_pnl": "<string>"
    }
  ]
}