Add hysteria and acme TLS certificate issuer (#18)

* Add hysteria client/server
* Add acme TLS certificate issuer

transport/hysteria/wrap.go

@@ -0,0 +1,56 @@
+package hysteria
+
+import (
+	"net"
+	"os"
+	"syscall"
+
+	"github.com/sagernet/quic-go"
+	"github.com/sagernet/sing/common"
+)
+
+type PacketConnWrapper struct {
+	net.PacketConn
+}
+
+func (c *PacketConnWrapper) SetReadBuffer(bytes int) error {
+	return common.MustCast[*net.UDPConn](c.PacketConn).SetReadBuffer(bytes)
+}
+
+func (c *PacketConnWrapper) SetWriteBuffer(bytes int) error {
+	return common.MustCast[*net.UDPConn](c.PacketConn).SetWriteBuffer(bytes)
+}
+
+func (c *PacketConnWrapper) SyscallConn() (syscall.RawConn, error) {
+	return common.MustCast[*net.UDPConn](c.PacketConn).SyscallConn()
+}
+
+func (c *PacketConnWrapper) File() (f *os.File, err error) {
+	return common.MustCast[*net.UDPConn](c.PacketConn).File()
+}
+
+func (c *PacketConnWrapper) Upstream() any {
+	return c.PacketConn
+}
+
+type StreamWrapper struct {
+	quic.Stream
+}
+
+func (s *StreamWrapper) Upstream() any {
+	return s.Stream
+}
+
+func (s *StreamWrapper) ReaderReplaceable() bool {
+	return true
+}
+
+func (s *StreamWrapper) WriterReplaceable() bool {
+	return true
+}
+
+func (s *StreamWrapper) Close() error {
+	s.CancelRead(0)
+	s.Stream.Close()
+	return nil
+}