chore: adjustable cwnd for cc in quic

transport/tuic/v4/client.go

@@ -36,6 +36,7 @@ type ClientOption struct {
 	MaxUdpRelayPacketSize int
 	FastOpen              bool
 	MaxOpenStreams        int64
+	CWND                  int
 }
 
 type clientImpl struct {
@@ -91,7 +92,7 @@ func (t *clientImpl) getQuicConn(ctx context.Context, dialer C.Dialer, dialFn co
 		return nil, err
 	}
 
-	common.SetCongestionController(quicConn, t.CongestionController)
+	common.SetCongestionController(quicConn, t.CongestionController, t.CWND)
 
 	go func() {
 		_ = t.sendAuthentication(quicConn)

transport/tuic/v4/server.go

@@ -33,6 +33,7 @@ type ServerOption struct {
 	CongestionController  string
 	AuthenticationTimeout time.Duration
 	MaxUdpRelayPacketSize int
+	CWND                  int
 }
 
 type Server struct {
@@ -57,7 +58,7 @@ func (s *Server) Serve() error {
 		if err != nil {
 			return err
 		}
-		common.SetCongestionController(conn, s.CongestionController)
+		common.SetCongestionController(conn, s.CongestionController, s.CWND)
 		h := &serverHandler{
 			Server:   s,
 			quicConn: conn,