feat: Deprecate embedded browser and import console (#12460)

This feature also changes the default port where
the browser is running, now the port has moved
to 9001 and it can be configured with

```
--console-address ":9001"
```

cmd/gateway-main.go

@@ -156,6 +156,11 @@ func ValidateGatewayArguments(serverAddr, endpointAddr string) error {
 func StartGateway(ctx *cli.Context, gw Gateway) {
 	defer globalDNSCache.Stop()
 
+	signal.Notify(globalOSSignalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT)
+
+	go handleSignals()
+
+	signal.Notify(globalOSSignalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT)
 	// This is only to uniquely identify each gateway deployments.
 	globalDeploymentID = env.Get("MINIO_GATEWAY_DEPLOYMENT_ID", mustGetUUID())
 	logger.SetDeploymentID(globalDeploymentID)
@@ -198,9 +203,6 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	// Initialize all help
 	initHelp()
 
-	// Get port to listen on from gateway address
-	globalMinioHost, globalMinioPort = mustSplitHostPort(globalCLIContext.Addr)
-
 	// On macOS, if a process already listens on LOCALIPADDR:PORT, net.Listen() falls back
 	// to IPv6 address ie minio will start listening on IPv6 address whereas another
 	// (non-)minio process is listening on IPv4 of given port.
@@ -263,11 +265,6 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	// Add server metrics router
 	registerMetricsRouter(router)
 
-	// Register web router when its enabled.
-	if globalBrowserEnabled {
-		logger.FatalIf(registerWebRouter(router), "Unable to configure web browser")
-	}
-
 	// Add API router.
 	registerAPIRouter(router)
 
@@ -292,8 +289,6 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	globalHTTPServer = httpServer
 	globalObjLayerMutex.Unlock()
 
-	signal.Notify(globalOSSignalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT)
-
 	newObject, err := gw.NewGatewayLayer(madmin.Credentials{
 		AccessKey: globalActiveCred.AccessKey,
 		SecretKey: globalActiveCred.SecretKey,
@@ -363,5 +358,19 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		printGatewayStartupMessage(getAPIEndpoints(), gatewayName)
 	}
 
-	handleSignals()
+	if globalBrowserEnabled {
+		consoleSrv, err := initConsoleServer()
+		if err != nil {
+			logger.FatalIf(err, "Unable to initialize console service")
+		}
+
+		go func() {
+			<-globalOSSignalCh
+			consoleSrv.Shutdown()
+		}()
+
+		consoleSrv.Serve()
+	} else {
+		<-globalOSSignalCh
+	}
 }