Calendar event fixes and improvements (#4690)

* fixes

* saving workspaceMemberId and personId when saving attendees

* add typing

* use Map

* improve saveMessageParticipants

* fix role type

* move logic in a service

* create new service

* use new service in calendar-event-attendee.service

* modify service to include more common logic

* add defaumt value to isOrganizer in calendar-event-attendee.object-metadata

* rename folder

* renaming

packages/twenty-server/src/modules/calendar/standard-objects/calendar-event-attendee.object-metadata.ts

@@ -65,6 +65,7 @@ export class CalendarEventAttendeeObjectMetadata extends BaseObjectMetadata {
     label: 'Is Organizer',
     description: 'Is Organizer',
     icon: 'IconUser',
+    defaultValue: false,
   })
   isOrganizer: boolean;