TimerService: make TimerResponse support redirect()

This allows executing a script doing REQUEST.RESPONSE.redirect() without error.

Before this patch it's an AttributeError similar to:

------
2022-04-12 03:52:49,083 WARNING ActivityTool Could not call method ...
Traceback (most recent call last):
  ...
  File "Script (Python)", line 34, in Base_redirect
    return request.RESPONSE.redirect(redirect_url, status=status_code)
AttributeError: TimerResponse instance has no attribute 'redirect'