* feat: add `type` filter for booking references API endpointa
* Update openapi.json
* feat: add enum validation for booking reference types in filter input
* refactor: rename externalUid to eventUid and add destinationCalendarId in booking references
* refactor: replace enum with const array for BookingReferenceType
* fix: type safety for booking references where clause using Prisma types
* refactor: rename BookingReferenceType to BookingReferences