LibCore: Move Stream-based sockets into the Core namespace

Author: https://github.com/timschumi
Commit: a96339b72b
Pull-request: https://github.com/SerenityOS/serenity/pull/17406
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibCore/NetworkJob.h

@@ -41,7 +41,7 @@ public:
         DetachFromSocket,
         CloseSocket,
     };
-    virtual void start(Core::Stream::Socket&) = 0;
+    virtual void start(Core::Socket&) = 0;
     virtual void shutdown(ShutdownMode) = 0;
     virtual void fail(Error error) { did_fail(error); }