[extractor/JdItemVideo] Add Extractor. To extract the video links from a JD.com product page

yt_dlp/extractor/_extractors.py

@@ -879,6 +879,9 @@ from .japandiet import (
     SangiinInstructionIE,
     SangiinIE,
 )
+
+from .jditemvideo import JdItemVideoIE
+
 from .jeuxvideo import JeuxVideoIE
 from .jove import JoveIE
 from .joj import JojIE