CollectionView2 Handler for Windows based on ItemsRepeater

[Redth]

Description

We've added a new CollectionView2 handler for MacCatalyst/iOS.

We can do the same with Windows now that there is a newer API available to use for virtualized lists of things.

@Foda has done some spikes on this, and the newer API is used already in Maui.VirtualListView

Public API Changes

CollectionView2Handler

Intended Use-Case

A newer implementation of the handler which performs better.

[PureWeen]

We almost have 1.7 merged in
#28499