Improve the current implementation of the Native Grid's virtualization with grouping

[PekoPPT]

Scenario: Native Grid with Virtualization + Grouping.

The field for improvement: The expand/collapse is slow if we have a big number of items in the group which is expanded/collapsed

Example: https://codesandbox.io/s/smoosh-waterfall-7gebk1?file=/src/App.vue

[PekoPPT]

Other issues related to the Native Grid's virtualization with grouping are discussed in ticket 1565647