[Paginated table] increase active chunks count

[artemmufazalov]

PaginatedTable loads and renders 150% of parent container height. It's 2-3 chunks, 100-150 row.

We need to increase this amount - 2 chunks up and down from the chunk in the viewport, to prevent loading rows on scroll.

1. Increase intersection margin - DEFAULT_INTERSECTION_OBSERVER_MARGIN
2. Tune DEBOUNCE_TIMEOUT, so it will be as low as possible, but at the same time no excessive data will be loaded on fast scroll
3. Add virtualization - load data, but do not render rows, until they are visible