[myvideoge] Add new extractor (#31360)

NB download tests on CI servers blocked 

Co-authored-by: Alfonso Solbes <fonk666@gmail.com>

youtube_dl/extractor/extractors.py

@@ -728,6 +728,7 @@ from .myvi import (
     MyviIE,
     MyviEmbedIE,
 )
+from .myvideoge import MyVideoGeIE
 from .myvidster import MyVidsterIE
 from .nationalgeographic import (
     NationalGeographicVideoIE,