Support chart selections for multi-view vega-lite & altair charts

[LukasMasuch]

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Summary

We're soon going to add chart selections for Altair in Streamlit, via st.altair_chart(..., on_select="rerun"). However, this only works with simple charts and not with multi-view / composite charts - e.g. vconcat, hconcat, layered, and repeat. There are many edge cases to handle selections on these charts correctly, so we're disallowing them for now.

If you'd like us to implement support for selections on multi-view charts, please upvote this issue with a 👍 and let us know in the comments below what types of chart composition types you would like to use.

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