feat: column picker/visibility toggle for large tables

[syncroniq-janthiart]

Most programs offer a column dropdown or picker menu when viewing large tables. While a chart editor can select which columns to add to a chart, read-only users, especially on embedded dashboards, are not so lucky as they can only ever see the full table. Tables with many columns can requiire horizontal scrolling, or they may look good on a large 4k screen but become a hassle on smaller ones.

Therefore, I would like to introduce a column visibility picker dropdown to the regular table chart (can of course be extended to other plugins as well, but would like to get a 👍 or 👎 first).

What this does

• Adds a small column picker button next to existing table controls (usually shows up next to search bar).
• Click on button opens picker menu with option to select all, none (but at least 1), or any number of columns in between.
• Selection is for visibility only. User can only pick columns defined by the table chart.
• (De-)Selecting a column immediately updates the chart to show/not show the column.

Demo:

column_picker_demo.mp4

Option must be enabled by chart editors:

Details

The change is very limited, only a couple of lines in TableChart + new component. The component is "persistent enough" (survives tab switches, does not survive reloads, recognizes updates to columns) and relies on visibility switches only - no cross-talk with any CSV downloads or similar kinds of functionality.

I would open a PR, but "discussion first" seems to be the go-to for new contributors. :)

https://github.com/syncroniq-janthiart/superset/tree/feat/user-column-selector-table