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>

internal/route/provider/stats.go

@@ -56,14 +56,14 @@ func (stats *RouteStats) AddOther(other RouteStats) {
 
 func (p *Provider) Statistics() ProviderStats {
 	var rps, streams RouteStats
-	p.routes.RangeAll(func(_ string, r *R.Route) {
-		switch r.Type {
-		case route.RouteTypeReverseProxy:
+	for _, r := range p.routes {
+		switch r.Type() {
+		case route.RouteTypeHTTP:
 			rps.Add(r)
 		case route.RouteTypeStream:
 			streams.Add(r)
 		}
-	})
+	}
 	return ProviderStats{
 		Total:   rps.Total + streams.Total,
 		RPs:     rps,