[bigo] Add extractor (#2749)

Fixes https://github.com/ytdl-org/youtube-dl/issues/18357

Authored by: Lesmiscore

yt_dlp/extractor/extractors.py

@@ -142,6 +142,7 @@ from .bfmtv import (
 )
 from .bibeltv import BibelTVIE
 from .bigflix import BigflixIE
+from .bigo import BigoIE
 from .bild import BildIE
 from .bilibili import (
     BiliBiliIE,