[Accessibility] Make columns resizable via keyboard

[kycutler]

Use case

Non-mouse users should be able to resize columns using the keyboard.

Proposed solution

1. Add a keyboard shortcut (such as Ctrl + Alt + Right / Left) that nudges the column size up / down
   • Alternatively make the resize handle focusable and enable a similar shortcut (but maybe a simpler one)
2. Expose a column resize method via the API to allow consumers to enable such functionality

[msftedad]

Hi team, Any update on this issue?