Create remove calendar event participants DELETE endpoint

[Said-Alisic]

Goal ⚽

Create an endpoint for removing participants from an existing calendar event

Requirements 🛠️

• Create a ParticipantsController in the Controllers folder

  ❕ May add the method to the CalendarEventsController instead with the name RemoveCalendarEventParticipants

• Create a DeleteParticipants endpoint method that takes a JSON request body as { calendarEventId: Guid, personIds: Guid[] } and removes one or more Participant records from the database with the given information