TUN inbound: Add gateway, dns, autoSystemRoutingTable, autoOutboundsInterface for Windows (#5887)

And refactor `mtu` to support setting IPv4/v6 separately

Example: https://github.com/XTLS/Xray-core/pull/5887#issue-4198837696

proxy/tun/tun_default.go

@@ -3,6 +3,8 @@
 package tun
 
 import (
+	"net"
+
 	"github.com/xtls/xray-core/common/errors"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 )
@@ -13,11 +15,8 @@ type DefaultTun struct {
 // DefaultTun implements Tun
 var _ Tun = (*DefaultTun)(nil)
 
-// DefaultTun implements GVisorTun
-var _ GVisorTun = (*DefaultTun)(nil)
-
 // NewTun builds new tun interface handler
-func NewTun(options TunOptions) (Tun, error) {
+func NewTun(options *Config) (Tun, error) {
 	return nil, errors.New("Tun is not supported on your platform")
 }
 
@@ -29,6 +28,18 @@ func (t *DefaultTun) Close() error {
 	return errors.New("Tun is not supported on your platform")
 }
 
+func (t *DefaultTun) Name() (string, error) {
+	return "", errors.New("Tun is not supported on your platform")
+}
+
+func (t *DefaultTun) Index() (int, error) {
+	return 0, errors.New("Tun is not supported on your platform")
+}
+
 func (t *DefaultTun) newEndpoint() (stack.LinkEndpoint, error) {
 	return nil, errors.New("Tun is not supported on your platform")
 }
+
+func setinterface(string, string, uintptr, *net.Interface) error {
+	return errors.New("Tun is not supported on your platform")
+}