[ie/ARDAudiothek] Add extractors (#14309)

Closes #5605, Closes #10671
Authored by: marieell, evilpie

Co-authored-by: marieell <marieell@tuta.io>

yt_dlp/extractor/_extractors.py

@@ -143,6 +143,8 @@ from .archiveorg import (
 from .arcpublishing import ArcPublishingIE
 from .ard import (
     ARDIE,
+    ARDAudiothekIE,
+    ARDAudiothekPlaylistIE,
     ARDBetaMediathekIE,
     ARDMediathekCollectionIE,
 )