[IMP] event: add payment status in barcode / attendee kanban view

PURPOSE

Introduce a clearer way of handling registrations for multiple events occurring
at the same time and place by

  * improve attendess kanban view;
  * introducing a Registration Desk menu item;

SPECIFICATIONS

Introduce a computed "payment_status" selection field, allowing to display
status of a registration, based on its SO and ``is_paid```field. It is better
fro UX and display. It is not stored as currently stored fields are sufficient
for current requirement.

Add it to the kanban view.

Prepare barcode improvements by improving _get_registration_summary returned
data dict, adding some information to display in event_barcode. Reorganize
registrations actions, and prepare a generic one leading to attendees kanban
view for registration desk.

LINKS

Task ID #2214290
Community PR odoo/odoo#47511
Enterprise PR odoo/enterprise#9190

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