htc: implement mux side of connecting (and more)

libraries/libstratosphere/source/htclow/mux/htclow_mux_channel_impl.hpp

@@ -61,13 +61,17 @@ namespace ams::htclow::mux {
 
             void RemovePacket(const PacketHeader &header);
 
+            void ShutdownForce();
+
             void UpdateState();
         public:
+            Result DoConnectBegin(u32 *out_task_id);
+            Result DoConnectEnd();
+
             void SetSendBuffer(void *buf, size_t buf_size, size_t max_packet_size);
             void SetReceiveBuffer(void *buf, size_t buf_size);
             void SetSendBufferWithData(const void *buf, size_t buf_size, size_t max_packet_size);
         private:
-            void ShutdownForce();
             void SetState(ChannelState state);
             void SetStateWithoutCheck(ChannelState state);