[Discover][KEYBOARD]: Would we consider adding a Select all / Deselect all control to the available fields for Discover?

[1Copenut]

Describe the feature:
While auditing the Discover data grid feature for keyboard navigation and accessibility, I had to press TAB and ENTER a high number of times to build dense data grids with multiple columns. I found myself wondering if a Select all and Deselect all control might make sense for this UI.

Describe a specific use case for the feature:

• I have created a data grid with a high number of columns, say 15. Instead of having to press the red X buttons to remove each column, I could press Deselect all and go back to a default data grid.
• I want a data grid with most of the available columns. I could select all with one click, then click 3-5 remove X buttons instead of clicking to add each column.

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[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[elasticmachine]

Pinging @elastic/kibana-accessibility (Project:Accessibility)

[kertal]

I think a Deselect all would make sense ... however given that we usually have a large number of fields, I would hesitate offering a Select all button because of the possible performance impact