stdlib: Add many missing dunder overrides (#7231)

stdlib/asyncio/events.pyi

@@ -59,6 +59,7 @@ class TimerHandle(Handle):
     def __le__(self, other: TimerHandle) -> bool: ...
     def __gt__(self, other: TimerHandle) -> bool: ...
     def __ge__(self, other: TimerHandle) -> bool: ...
+    def __eq__(self, other: object) -> bool: ...
 
 class AbstractServer:
     @abstractmethod