text: Title: Request for AutoGuideList in numpyro
  Body: It would be great if AutoGuideList (https://docs.pyro.ai/en/stable/infer.autoguide.html#autoguidelist) was added to numpyro. 
  
  I've seen this discussed on a forum (https://forum.pyro.ai/t/using-a-combination-of-autoguides-for-a-single-model/5328), and I would really appreciate this feature in Numpyro, so more of my models can be easily translated from Pyro.
  Until it is implemented, it would be cool to have somewhere in the tutorials an example of how different AutoGuides for different variables can currently be combined.