[ADD] payment_stripe_sca: Stripe API changes following PSD2

With the PSD2 directive coming into effect on September 14th,
was had no choice but to switch our Stripe integration to use
newer APIs that support Strong Customer Authentication (SCA for short).

This meant switching from the old stripe.js implementation for
'redirection' flow to the Stripe Checkout API and from the
Charge API to the newer SetupIntent API for s2s flows.

This new modules introduce these changes in a non-intrusive way,
this means that installing this module is *not* required for
all customers (e.g. instances only accepting payment to and
from countries that are not part of the EU), that installing it
will support SCA flows and that uninstallation leaves you with
a working instance as well. Essentially a backport of 9f5f2fc
in a seperate module.

Task 2039100

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