Lists of displayables

[rgbkrk]

Wouldn't it be neat if we could display a list of items (if small enough) as their rich repr version?

In[1]: [Image(), Image(), Image()]

Out[1]: [
  IMAGE,
  IMAGE,
  IMAGE
]

[rgbkrk]

Seems like we'd need a higher level mimetype that's a container. 🤔

application/jupyter-container+json

[Carreau]

cc @mpacer who want something similar for subfigures.