[IMP] website_(portal_sale|sale|quote), payment: add authorization payment flow steps

This allows using a modern e-commerce flow where amounts are first
authorized at checkout then captured when the picking is in fact
shipped instead of immediately capturing the amount.

To access this flow, a new selection value is available on the payment
acquirer: "Authorize the amount and confirm the SO on acquirer
confirmation". If this value is selected, s2s/form transactions should
only require authorization to the acquirer; the user can then
capture/void the payment manually from the Odoo backend transaction
form view by simply using buttons.

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