[ie/Boosty] Add extractor (#9144)

Closes #5900, Closes #8704
Authored by: un-def

yt_dlp/extractor/_extractors.py

@@ -257,6 +257,7 @@
 from .bloomberg import BloombergIE
 from .bokecc import BokeCCIE
 from .bongacams import BongaCamsIE
+from .boosty import BoostyIE
 from .bostonglobe import BostonGlobeIE
 from .box import BoxIE
 from .boxcast import BoxCastVideoIE