Selected row + export data support for grid blocks (new table component)

[aptkingston]

Description

This PR adds support for hooking into the selected rows of the new table component (grid block).

• There's a new binding provided by tables for "Selected rows" which are the full selected row objects. This works for any sort of datasource - a big improvement over the old table component. You can then use this as you see fit.

• Support has been added for the "Export data" button action. No config changes needed - you can just select new table components as well as old ones. Behind the scenes I've moved away from the deprecated "row selection store" but there's no difference to the user. Exporting data still only works for table datasources, as always.

Other stuff

When blurring a grid (clicking outside it) we no longer deselect any selected rows. This applies across the board. Hovered and focused cell will still be unset.

Addresses

• https://linear.app/budibase/issue/BUDI-8151/allow-the-ability-to-reference-the-selected-rows-for-the-new-table
• https://github.com/Budibase/budibase/issues/13421

Feature branch env

Feature Branch Link