Creates a new attendee

curl --request POST \
  --url https://api.cal.com/v1/attendees \
  --header 'Content-Type: application/json' \
  --data '{
  "bookingId": 123,
  "email": "[email protected]",
  "name": "<string>",
  "timeZone": "<string>"
}'

{
  "attendee": {
    "id": 255,
    "bookingId": 313,
    "name": "Justin Doe",
    "email": "[email protected]",
    "timeZone": "Asia/Jerusalem"
  },
  "message": "Attendee created successfully"
}