Add route context (#2302)

sanic/mixins/signals.py

@@ -4,11 +4,7 @@ from typing import Any, Callable, Dict, Optional, Set, Union
 from sanic.models.futures import FutureSignal
 from sanic.models.handler_types import SignalHandler
 from sanic.signals import Signal
-
-
-class HashableDict(dict):
-    def __hash__(self):
-        return hash(tuple(sorted(self.items())))
+from sanic.types import HashableDict
 
 
 class SignalMixin: