feat: add support for nsfw for ThreadChannel

Author: feelixs

interactions/models/discord/channel.py

@@ -1900,6 +1900,10 @@ def parent_channel(self) -> Union[GuildText, "GuildForum"]:
         """The channel this thread is a child of."""
         return self._client.cache.get_channel(self.parent_id)
 
+    @property
+    def nsfw(self) -> bool:
+        return self.parent_channel.nsfw
+
     @property
     def parent_message(self) -> Optional["Message"]:
         """The message this thread is a child of."""