Add card surcharges to help cover Stripe Fee

Update: We’re 99% done on this, in the final stages of testing.
Also important to point out that it is being implemented as a “card surcharge” - which adds a fee to the invoice if the client chooses to pay by card. The rounded user will still be paying the fee to the stripe, there will just be an extra charge on the invoice to cover that fee.
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I’ve used other invoicing programs before that have given the choice to pass the Stripe fee onto the client if they chose to use that payment method.

Would love to see this implemented.