Feat/fileserver (#60)

* cleanup code for URL type

* fix makefile for trace mode

* refactor, merge Entry, RawEntry and Route into one. 

* Implement fileserver.

* refactor: rename HTTPRoute to ReverseProxyRoute to avoid confusion

* refactor: move metrics logger to middleware package

- fix prometheus metrics for load balanced routes
  - route will now fail when health monitor fail to start

* fix extra output of ls-* commands by defer initializaing stuff, speed up start time

* add test for path traversal attack, small fix on FileServer.Start method

* rename rule.on.bypass to pass

* refactor and fixed map-to-map  deserialization

* updated route loading logic

* schemas: add "add_prefix" option to modify_request middleware


* updated route JSONMarshalling

---------

Co-authored-by: yusing <yusing@6uo.me>

cmd/main.go

@@ -35,9 +35,6 @@ func init() {
 	}
 	logging.InitLogger(out)
 	// logging.AddHook(v1.GetMemLogger())
-	internal.InitIconListCache()
-	homepage.InitOverridesConfig()
-	favicon.InitIconCache()
 }
 
 func main() {
@@ -120,13 +117,17 @@ func main() {
 		printJSON(cfg.Value())
 		return
 	case common.CommandDebugListEntries:
-		printJSON(cfg.DumpEntries())
+		printJSON(cfg.DumpRoutes())
 		return
 	case common.CommandDebugListProviders:
 		printJSON(cfg.DumpRouteProviders())
 		return
 	}
 
+	go internal.InitIconListCache()
+	go homepage.InitOverridesConfig()
+	go favicon.InitIconCache()
+
 	cfg.Start(&config.StartServersOptions{
 		Proxy: true,
 	})