Kanban (#393)

Fix tests

Add error docs

Add swagger docs for bucket endpoints

Add integration tests

Fix tests

Fix err shadow

Make sure a bucket and a task belong to the same list when adding or updating a task

Add tests

Add getting users of a bucket

Fix log level when testing

Fix lint

Add migration for buckets

Cleanup/Comments/Reorganization

Add Kanban bucket handling

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/393

pkg/models/models.go

@@ -51,6 +51,7 @@ func GetTables() []interface{} {
 		&TaskRelation{},
 		&TaskAttachment{},
 		&TaskComment{},
+		&Bucket{},
 	}
 }