[screenjunkies] Add new extractor

This doesn't handle the plus only videos yet

Closes #8492

youtube_dl/extractor/__init__.py

@@ -621,6 +621,7 @@ from .sbs import SBSIE
 from .scivee import SciVeeIE
 from .screencast import ScreencastIE
 from .screencastomatic import ScreencastOMaticIE
+from .screenjunkies import ScreenJunkiesIE
 from .screenwavemedia import ScreenwaveMediaIE, TeamFourIE
 from .senateisvp import SenateISVPIE
 from .servingsys import ServingSysIE