Support HSA/FSA card type option

[Omar-Jazz]

Hello there!

I appreciate the hard work you have put in to add this wonderful API toolsets.
For instance, Is it possible to support HSA/FSA payment? I couldnt find any code for it.
It has to be something like this in the transfer body:
"hsa_fsa_payment": true,

I was thinking if it can be added here:

finix-java/src/main/java/model/CreateTransferRequest.java

Line 711 in e2254e1

public String toString() {

Finix HSA Fsa documentation:
https://finix.com/docs/guides/payments/modify/hsa-fsa/#accept-health-savings-account-hsa-or-flexible-spending-account-fsa-cards

Thanks