Incubator-superset: No sandbox.js ? chart tooltips

[eried]

I am trying to add tooltips to a deck.gl Scatterplot, but I cannot find any documentation and the link for sandbox.js is broken

Expected results

Any type of documentation on how to add tooltips with "Extra data for JS"

Actual results

No documentation, broken link to the sourcecode

Screenshots

How to reproduce the bug

1. Add a chart using deck.gl Scatterplot
2. Edit the chart
3. In Advanced -> Edit javascript in modal
4. See error

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[jtotoole]

Broken link (https://github.com/apache/incubator-superset/blob/master/superset/assets/src/modules/sandbox.js) is here: https://github.com/apache/incubator-superset/blob/7f1012360a8c0dd6860e80f852026017c09b746c/superset-frontend/src/explore/controlPanels/Shared_DeckGL.jsx#L33-L34

I don't see a sandbox.js file anywhere in the project at this point, so I'm not sure what that should be corrected to.

This should probably be two separate issues: one for the broken link and one for the lack of documentation on user-defined functions for Deck.gl visualizations, which has also been mentioned here:

https://github.com/apache/incubator-superset/issues/7174
https://github.com/apache/incubator-superset/issues/6020

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