feat(SimpleRouter): add global middleware support

unstable/simplerouter/types.go

@@ -5,7 +5,8 @@ import "net/http"
 type Middleware func(http.Handler) http.Handler
 
 type RouteGroup struct {
-	mux         *http.ServeMux // A ponter to the underlying ServeMux, this allows us to call ListenAndServe on any instance
-	basePath    string         // The current path we are defining handlers on / appending to
-	middlewares []Middleware   // Stack of middlewares that will be applied on a handler in order
+	mux                *http.ServeMux // A ponter to the underlying ServeMux, this allows us to call ListenAndServe on any instance
+	basePath           string         // The current path we are defining handlers on / appending to
+	middlewares        []Middleware   // Stack of middlewares that will be applied on a handler in order
+	global_middlewares []Middleware
 }