Introduce go chi web framework as frontend of macaron, so that we can move routes from macaron to chi step by step (#7420)

* When route cannot be found on chi, go to macaron

* Stick chi version to 1.5.0

* Follow router log setting

integrations/git_helper_for_declarative_test.go

@@ -82,7 +82,7 @@ func onGiteaRun(t *testing.T, callback func(*testing.T, *url.URL), prepare ...bo
 		defer prepareTestEnv(t, 1)()
 	}
 	s := http.Server{
-		Handler: mac,
+		Handler: c,
 	}
 
 	u, err := url.Parse(setting.AppURL)