Add pause function for proxies

client/internal/wgproxy/proxy.go

@@ -8,5 +8,7 @@ import (
 // Proxy is a transfer layer between the relayed connection and the WireGuard
 type Proxy interface {
 	AddTurnConn(ctx context.Context, turnConn net.Conn) (net.Addr, error)
+	Work()
+	Pause()
 	CloseConn() error
 }