[rokfin] Add extractor (#1534)

Authored by: P-reducible, pukkandan

yt_dlp/extractor/extractors.py

@@ -1333,6 +1333,7 @@ from .reverbnation import ReverbNationIE
 from .rice import RICEIE
 from .rmcdecouverte import RMCDecouverteIE
 from .rockstargames import RockstarGamesIE
+from .rokfin import RokfinIE
 from .roosterteeth import RoosterTeethIE, RoosterTeethSeriesIE
 from .rottentomatoes import RottenTomatoesIE
 from .rozhlas import RozhlasIE