Moved implementations to extensions

src/cpl_query/extension/__init__.py

@@ -20,6 +20,11 @@ __version__ = '2021.10.0.post1'
 from collections import namedtuple
 
 # imports:
+from iterable_abc import IterableABC
+from iterable import Iterable
+from list import List
+from ordered_iterable_abc import OrderedIterableABC
+from ordered_iterable import OrderedIterable
 
 VersionInfo = namedtuple('VersionInfo', 'major minor micro')
 version_info = VersionInfo(major='2021', minor='10', micro='0.post1')