Ability to pick guest responsibility/ownership in public court booking interface

We currently allow members to bring up to 3 guests for free during their membership. However, when booking a doubles court for 4 people, the reservation owner is automatically assigned as the one bringing the guest. This results in the reservation owner using their guest allowance, even if another player actually invited the guest.

There is already a feature in the admin portal that allows switching guest ownership, so it likely wouldn’t require much effort to make this functionality available in the public booking interface. Ideally, this option should be configurable and enabled or disabled by the portal admin through the backend settings.