feat: add currency support when creating card tokens

[charliecruzan-stripe]

Summary

Add support for setting currency in a card token

Motivation

https://jira.corp.stripe.com/browse/RUN_DX-1037

Testing

• I tested this manually
• I added automated tests

Documentation

Select one:

• I have added relevant documentation for my changes.
• This PR does not result in any developer-facing changes.

[LukeKosner]

Hi @charliecruzan-stripe,

I have the following integration in order to upload a debit card for Stripe Connect payouts:

  async function capturePayoutCard() {
    createToken({
      card,
      currency: "usd",
    })
      .then(({ token }) => {
        console.log(token);
      })
    return (
      <StripeProvider
        ...
      >
        <SafeAreaView>
          <CardField
            postalCodeEnabled
            onCardChange={(cardDetails) => {
              setCard(cardDetails);
              setCard((card) => ({ ...card, currency: "usd" }));
            }}
          />
          <TouchableOpacity
            onPress={() => uploadCard()}
          >
            <Text>Upload Card</Text>
          </TouchableOpacity>
        </SafeAreaView>
      </StripeProvider>
    );

Returned is the following (test-mode) token:

Object {
  "bankAccount": null,
  "card": Object {
    "address": Object {
      "city": null,
      "country": null,
      "line1": null,
      "line2": null,
      "postalCode": null,
      "state": null,
    },
    "brand": "Visa",
    "country": "US",
    **"currency": null,**
    "expMonth": 12,
    "expYear": 2034,
    "funding": "Debit",
    "last4": "5556",
  },
  "created": "1651357079000",
  "id": "...",
  "livemode": false,
  "type": "Card",
}

How should I add the currency tag? Thank you so much.

[charliecruzan-stripe]

is that on ios or android, and which version of stripe-react-native?