ApplePay: Confirm payment on the server

[TommasoTate]

Our implementation needs to tokenize ApplePay and GooglePay payment methods in order to process the payment server side.

As recently added for useGooglePay (#441), I wonder if there's already a timeline for adding a createApplePayPaymentMethod function to useApplePay hook.
If not, I would ask if there's any workaround we can follow in order to temporarily emulate this feature.

[thorsten-stripe]

@TommasoTate Apple Pay automatically returns the payment method when presentApplePay resolves: https://stripe.dev/stripe-react-native/api-reference/modules.html#ApplePayResult

You can then send the payment method to your server and charge it there. Afterward you will need to return the client_secret of your PaymentIntent to your client and call confirmApplePayPayment with it in order to close the Apple Pay sheet.