[ie/soop] Support subscription-only VODs (#15523)

* Add custom downloader SoopVodFD

Closes #13636
Authored by: thematuu

yt_dlp/downloader/__init__.py

@@ -36,6 +36,7 @@ from .rtsp import RtspFD
 from .websocket import WebSocketFragmentFD
 from .youtube_live_chat import YoutubeLiveChatFD
 from .bunnycdn import BunnyCdnFD
+from .soop import SoopVodFD
 
 PROTOCOL_MAP = {
     'rtmp': RtmpFD,
@@ -56,6 +57,7 @@ PROTOCOL_MAP = {
     'youtube_live_chat': YoutubeLiveChatFD,
     'youtube_live_chat_replay': YoutubeLiveChatFD,
     'bunnycdn': BunnyCdnFD,
+    'soopvod': SoopVodFD,
 }