[extractor/mocha] Add extractor (#4213)

Closes https://github.com/yt-dlp/yt-dlp/issues/3752
Authored by: HobbyistDev

yt_dlp/extractor/_extractors.py

@@ -948,6 +948,7 @@ from .mlb import (
 )
 from .mlssoccer import MLSSoccerIE
 from .mnet import MnetIE
+from .mocha import MochaVideoIE
 from .moevideo import MoeVideoIE
 from .mofosex import (
     MofosexIE,