service: Add support for debug controller

Merged Philip Withnall requested to merge debug-controller into main

This exposes an object on D-Bus for controlling the debug output of the service, subject to authorization using polkit.

This adds a dependency on libpolkit-gobject, and bumps the GLib dependency to 2.72. If the right version of GLib is not available, the debug controller will be disabled.

Signed-off-by: Philip Withnall

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