Proxy: Add TUN inbound for Windows & Linux, including Android (#5464)

* Proxy: Implement tun raw network interface inbound support for Linux

* Proxy: Tun. Include "android" as build condition for build of tun_default implementation

* Proxy: Tun. Add .Close() cleanup calls to Handler.Init() where needed

* Proxy: Add Tun for Android

* Proxy: Tun. Implement Windows support

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Co-authored-by: yuhan6665 <1588741+yuhan6665@users.noreply.github.com>

proxy/tun/stack.go

@@ -0,0 +1,17 @@
+package tun
+
+import (
+	"time"
+)
+
+// Stack interface implement ip protocol stack, bridging raw network packets and data streams
+type Stack interface {
+	Start() error
+	Close() error
+}
+
+// StackOptions for the stack implementation
+type StackOptions struct {
+	Tun         Tun
+	IdleTimeout time.Duration
+}