Zoom/pan events for maps

[jrieke]

Checklist

• I have searched the existing issues for similar feature requests.
• I added a descriptive title and summary to this issue.

Summary

We will soon add selections to charts (st.plotly_chart and st.altair_chart) and dataframes (st.dataframe) via the new on_select parameters. #8653 covers selection events on maps. We should also think about adding zoom/pan events to maps (st.pydeck_chart and st.map).

Why?

Let us know in the comments if you have specific use cases in mind!

How?

We should probably add a new event parameter (e.g. on_zoom_pan or on_relayout or on_move). Or we could think about integrating it with on_select in some way (which would make the implementation a lot easier but might be a bit less obvious from UX perspective).

Additional Context

Related issues:

• Selection events for maps #8653
• Zoom/pan events for charts #8655

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