[abcnews] Added a new extractor (closes #3992)

Related: #6108, #8664, #9459

youtube_dl/extractor/extractors.py

@@ -3,6 +3,10 @@
 
 from .abc import ABCIE
 from .abc7news import Abc7NewsIE
+from .abcnews import (
+    AbcNewsIE,
+    AbcNewsVideoIE,
+)
 from .academicearth import AcademicEarthCourseIE
 from .acast import (
     ACastIE,