This PR refactors the table virtualization real index main state that
was creating performance problems.
The problem was that we kept track of all the real rows even if we only
print 200 at a time in the application.
This caused a crash when some users with 10k+ rows on a table tried to
iterate over this state 10.000 times or more.
The trade-off is that now we keep all real indices in a Map, and each
virtual row uses a selector to go to this Map.
This way if we want to reset the full Map, we just have to overwrite the
base state that contains the map, and the 200 selectors will recompute.
This happens for example when we delete a row. This now has a limited
and negligible performance impact.
