feat: removeAllRoutes public method

This method allows to clear routes stack. As discussed here: expressjs/express#4296

index.js

@@ -435,6 +435,16 @@ Router.prototype.process_params = function process_params(layer, called, req, re
   param()
 }
 
+/**
+ * Remove all paths from the current stack
+ *
+ * @public
+ */
+
+Router.prototype.removeAllRoutes = function removeAllRoutes() {
+  this.stack = []
+}
+
 /**
  * Use the given middleware function, with optional path, defaulting to "/".
  *