add a way to customize the handler names (recommended: before server execution) so route logging can be more human-friendly on handlers like standard iris middlewares, e.g. request logger

Former-commit-id: 039c233f2d4da0d52b1d6fc86b6d73be14b15608

middleware/logger/logger.go

@@ -11,6 +11,10 @@ import (
 	"github.com/ryanuber/columnize"
 )
 
+func init() {
+	context.SetHandlerName("iris/middleware/logger.*", "Request Logger")
+}
+
 type requestLoggerMiddleware struct {
 	config Config
 }