Get portfolio positions

curl --request GET \
  --url https://api.context.markets/v2/portfolio/{address}/positions \
  --header 'Authorization: Bearer <token>'

{
  "positions": [
    {
      "marketId": "0x1111111111111111111111111111111111111111111111111111111111111111",
      "slug": "<string>",
      "marketName": "<string>",
      "outcomeName": "<string>",
      "outcomeIndex": 123,
      "size": "1000000",
      "avgPrice": "1000000",
      "price": "1000000",
      "claimState": "claimable",
      "claimableAmount": "1000000",
      "tokensRedeemed": "1000000",
      "status": "open"
    }
  ],
  "cursor": "<string>"
}