Feature/callbacks (#2678)

* wip

* initialize callbacks

* wip

* smtp

* list_service_interfaces

* wip

* wip

* fix domains

* fix hostname handling in NetService

* misc fixes

* getInstalledPackages

* misc fixes

* publish v6 lib

* refactor service effects

* fix import

* fix container runtime

* fix tests

* apply suggestions from review

web/projects/ui/src/app/services/api/mock-patch.ts

@@ -74,7 +74,7 @@ export const mockPatchData: DataModel = {
     platform: 'x86_64-nonfree',
     zram: true,
     governor: 'performance',
-    smtp: 'todo',
+    smtp: null,
     wifi: {
       interface: 'wlan0',
       ssids: [],