This commit adds /donation/* routes to perform the donation:
- /pay: shows the form with the contact details and donation details
- /transaction: creates the partner_id if missing and executes the
transaction
- /confirm: displays the payment success page
PR-63133
task-2398403
Part-of: odoo/odoo#63133
Customer portal controller and templates contained in website_payment
module are moved to payment. This module now uses the customer portal
defined in portal module and most of website_payment code is moved
to payment.
website_payment now contain code really related to website, such as
payment acquirers configuration for website.