Allow setting tax amount on stripe payments

[MTRNord]

Strip provides the amount_details.tax.total_tax_amount field in https://docs.stripe.com/api/payment_intents/create?api-version=2026-01-28.preview&rds=1#create_payment_intent-amount_details-tax-total_tax_amount which is "The total amount of tax on the transaction represented in the smallest currency unit."

It would be nice if this can be automatically set considering the store already is aware of the tax rate for a payment.