feat(badges): event specific perk grantage logic (emperkelation)

[japsu]

• [x] store personal perks on Badge
• [x] event specific logic to grant perks
• [x] show perks in checkin view
  • [x] configure display names for perk slugs
  • [ ] hide or grey out shirt size for those not having swag
• [ ] allow overriding perks in volunteer management
• [x] Tracon 2024 specifics:
  • [x] emperkelation logic for volunteer workers
  • [x] setup perks for programme roles