Add DestIpAddress() in Dialer interface

Android client prepares an IP before proxy connection is established. It is useful when connecting to wireguard (or quic) outbound with domain address. E.g. engage.cloudflareclient.com:2408

app/proxyman/outbound/handler.go

@@ -229,6 +229,10 @@ func (h *Handler) Address() net.Address {
 	return h.senderSettings.Via.AsAddress()
 }
 
+func (h *Handler) DestIpAddress() net.IP {
+	return internet.DestIpAddress()
+}
+
 // Dial implements internet.Dialer.
 func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connection, error) {
 	if h.senderSettings != nil {