When finding the minSendAmount in PaymentSession, we currently rely on exponential probing followed by a binary search, which is quite inefficient, but presently the only way to find this amount.

interledger/rafiki#3411 adds a minSendAmount detail in error responses which we want to use instead of us probing. #1103 updates OP SDK to include these details when available from server.

Once a newer Rafiki version is released, and there's some wallet (likely the Test Wallet) using that Rafiki version (so we can validate the results), update the PaymentSession.findMinSendAmount method to support this new feature, while maintaining backward compatibility.