getAll method is used to retrieve a list of pending alarms.
A DOMRequest object to handle the success or failure of the method call.
If the method call is successful, the request's
result will be an array of mozAlarm objects.
id- A number representing the id of the alarm
date- A Date object representing the scheduled time for the alarm
respectTimezone- A string indicating if the alarm must respect or ignore the timezone information of the date object. Its value can be ignoreTimezone or honorTimezone