Integration with user / contacts and User groups used in icingaweb for notifications

[andickts]

Is your feature request related to a problem? Please describe.

There are large organizations that make extensive use of groups for managing notifications in icingaweb2. Changes by individual users can thus be made at the group level and not by individual notification.

Describe the solution you'd like

It would be very convenient to be able to make use of the groups defined in the notifications also for sending reports so as not to have to change the list of individual reports for the variation of individual contacts.