add 'absolute' to attribute timestamp options

[Mariusthvdb]

as title, considering https://www.home-assistant.io/dashboards/entities/#attribute options we now have are:
relative, total, date, time and datetime.

to be able to do:

we now need a template still:

      - unique_id: sunset_offset
        name: Sunset offset
        state: >
          {% set nw = now().timestamp() %}
          {% set ss = as_timestamp(state_attr('sun.sun','next_setting')) %}
          {{'- ' if nw < ss}}{{(nw - ss)|abs|timestamp_custom('%H:%M:%S',false)}}
        icon: mdi:weather-sunset-down

      - unique_id: sunrise_offset
        name: Sunrise offset
        state: >
          {% set nw = now().timestamp() %}
          {% set ss = as_timestamp(state_attr('sun.sun','next_rising')) %}
          {{'- ' if nw < ss}}{{(nw - ss)|abs|timestamp_custom('%H:%M:%S',false)}}
        icon: mdi:weather-sunset-up

since having an absolute timing in the frontend isnt a very exotic wish (we need more precision than 'Tomorrow') and clicking the more-info shows the actual time only:

adding this to the toolbox would be very welcome.

Hope you will consider, thanks!