getPortfolios function returns an object containing an array of
portfolios for the provided addresses. Each portfolio is an object with the address
of the wallet, the fiat value of the portfolio, and an array of tokens held by the
provided address.
getPortfolios is only available for Base mainnet and Ethereum mainnet.
You can control the network in the OnchainKitProvider by setting the chain prop.Promise<GetPortfoliosResponse>
GetPortfoliosParams