text: Title: Lambda Warmer
  Body: Hello,
  
  I'm using fast api and AWS Lambda, and migrated successfully my projects thanks to your plugin, thanks a lot for that.
  
  I'm now trying to add a warmer so that my lambda is called every 5 min.
  I've found this https://pypi.org/project/lambda-warmer-py/ and I'm struggling to add the decorator since to work, we don't have any function to call.
  
  How shoud I do to make use of this lambda warmer ?
  
  I've tried to create a function named handler which would return Mangum(app) if 'warmer' not in events but this doesn't work.
  
  A bit lost here how to do so
  
  thanks