native NetworkManager + all native dbus bindings via dms

- Scrap janky NetworkService in favor of, dms' native NM integration
  socket
- Scrap all gdbus usage in favor of native dbus bindings in dms
  (loginctl, freedesktop)

It means that - some features won't work if running without dms wrapper.

But the trade off is certainly worth it, in the long-run for efficiency
improvements.

Modules/ControlCenter/BuiltinPlugins/VpnWidget.qml

@@ -1,5 +1,6 @@
 import QtQuick
 import QtQuick.Layouts
+import Quickshell
 import qs.Common
 import qs.Services
 import qs.Widgets
@@ -8,6 +9,10 @@ import qs.Modules.Plugins
 PluginComponent {
     id: root
 
+    Ref {
+        service: VpnService
+    }
+
     ccWidgetIcon: VpnService.isBusy ? "sync" : (VpnService.connected ? "vpn_lock" : "vpn_key_off")
     ccWidgetPrimaryText: "VPN"
     ccWidgetSecondaryText: {