🌟Provisional Reservation List with Payment Guarantee

[justusweigmann]

Is your feature request related to a problem? Please describe.
The current problem is that we lack a mechanism to capture reservations with payment details for certain events without immediately processing a payment. This makes it difficult for us to assess the financial viability of an event before its execution while simultaneously securing firm commitments from interested parties.

Describe the solution you'd like
We require a new feature called "Provisional Reservation with Payment Guarantee" that has the following characteristics:

1. Customers can make a reservation and provide their payment details without an immediate charge being processed.
2. The reservation status should be marked as "Provisionally Confirmed."
3. The system should provide an overview of all provisional reservations along with their associated payment information.
4. Once a predetermined number of reservations is reached or the organizer decides to proceed with the event, there should be a function available to convert all provisional reservations into binding ones and initiate the payments.
5. Customers should be automatically notified when their provisional reservation is confirmed and the payment is processed.
6. In case the event does not take place, there should be a simple way to cancel all provisional reservations without any payments being processed.

Additional context
This feature is similar to a waiting list but differs in that it is used prior to the event and guarantees a ticket to all participants with stored payment details once the event is confirmed. This allows us to minimize financial risk while gauging interest in the event. The implementation should be compatible with common online payment systems and comply with data protection guidelines.