Problems detecting and using Stripe payment methods other than credit cards

[rainerdema]

Introduction

Even if there is already partial support for non-card Stripe Payment Methods, they still need to be fully supported.

Current behavior

When trying to add a sepa_debit payment method type, by enabling it from the Stripe dashboard, these are the problems encountered:

• Stripe Payment Methods cannot be attached to the created Stripe Payment Intent if this doesn't have the automatic_payment_methods enabled.
• The default payment method partial view (dedicated to existing payment methods and details in the confirm step) is not rendered correctly and generates an exception due to missing params.
• Stripe Payment Intent "processing" status, allowed in some payment methods like "sepa_debit", is not managed, so the payment is marked as failed in Solidus.

Expected behavior

It's expected to see the supported and enabled Stripe payment methods in the checkout payment section and be able to use them (even without a dedicated configuration other than the one made for credit cards).