[PRX] Add Extractors (#2245)

Closes #2144, https://github.com/ytdl-org/youtube-dl/issues/15948

Authored by: coletdjnz

yt_dlp/extractor/extractors.py

@@ -1216,6 +1216,13 @@ from .puhutv import (
 from .presstv import PressTVIE
 from .projectveritas import ProjectVeritasIE
 from .prosiebensat1 import ProSiebenSat1IE
+from .prx import (
+    PRXStoryIE,
+    PRXSeriesIE,
+    PRXAccountIE,
+    PRXStoriesSearchIE,
+    PRXSeriesSearchIE
+)
 from .puls4 import Puls4IE
 from .pyvideo import PyvideoIE
 from .qqmusic import (