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Introduce API for handling cgroups

David Edmundson requested to merge work/cgroups2 into master

A model is exposed that groups processes by cgroup and provides grouped information.

The model can be started and stopped and can be set to follow a given root. All system units, all users, or a specific slice within that.

Information for all pids is calcuated totalled and included via the ProcessAttribute helpers.

Cgroups are set to handle applications that follow https://systemd.io/DESKTOP_ENVIRONMENTS for grouping of applications. A convenience model ApplicationDataModel subclass exposes this directly.

The exposed model is a 1:1 mapping of ProcessDataModel for easy drop-in.

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