Add currency selector to dedicated consent initiation screen

Before, during consent initiation, fintech provided account as a list of IBAN strings. Now we need to provide account list as a list of account reference type:

Before:
"accounts": ["DE80760700240271232400"],
"balances": ["DE80760700240271232400"],
"transactions": ["DE80760700240271232400"]

Now:
"accounts": [
{
"iban": "DE80760700240271232400",
"currency": "EUR"
}
],
"balances": [
{
"iban": "DE80760700240271232400",
"currency": "EUR"
}
],
"transactions": [
{
"iban": "DE80760700240271232400",
"currency": "EUR"
}
]