User Data Export and import (#967)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/967
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

pkg/models/namespace.go

@@ -187,6 +187,11 @@ type NamespaceWithLists struct {
 	Lists     []*List `xorm:"-" json:"lists"`
 }
 
+type NamespaceWithListsAndTasks struct {
+	Namespace
+	Lists []*ListWithTasksAndBuckets `xorm:"-" json:"lists"`
+}
+
 func makeNamespaceSlice(namespaces map[int64]*NamespaceWithLists, userMap map[int64]*user.User, subscriptions map[int64]*Subscription) []*NamespaceWithLists {
 	all := make([]*NamespaceWithLists, 0, len(namespaces))
 	for _, n := range namespaces {