Add device_class: alarm and timer to integrate with googlehome component

see: Using Google Home Alarm Timestamp as Trigger (Solved)

we’d need an alarm for device_class to have binary_sensors template show mdi:alarm and mdi:alarm-off,

and for timer:

mdi:timer mdi:timer-off

to create a nice interface to the google home integration for timers and alarms provided by the googlehome component, and others of course.

please consider adding these 2 classes?
(not sure if this list is complete, but tried and no alarm icon appeared). no listing either on