feat: let display hook handle clear_output #1135
Merged
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A display hook can handle a publish message, but not yet a clear_output
Upstreaming of: widgetti/solara#132
Follow up of: #1110
Related: https://github.com/ipython/ipykernel/pull/115/files
Would enable jupyter-widgets/ipywidgets#3759 to fully work kernel side.