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

core/models/src/id/package.rs

@@ -61,6 +61,11 @@ impl Borrow<str> for PackageId {
         self.0.as_ref()
     }
 }
+impl<'a> Borrow<str> for &'a PackageId {
+    fn borrow(&self) -> &str {
+        self.0.as_ref()
+    }
+}
 impl AsRef<Path> for PackageId {
     fn as_ref(&self) -> &Path {
         self.0.as_ref().as_ref()