Make AddressObject object_id an extrinsic property

crates/carddav/src/address_object/service.rs

@@ -57,6 +57,7 @@ impl<AS: AddressbookStore> ResourceService for AddressObjectResourceService<AS>
             .await?;
         Ok(AddressObjectResource {
             object,
+            object_id: object_id.to_owned(),
             principal: principal.to_owned(),
         })
     }