[Epic] CollectionView2 Handler for Windows based on ItemsRepeater

### 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](https://github.com/redth/maui.virtuallistview)

### Public API Changes

CollectionView2Handler

### Intended Use-Case

A newer implementation of the handler which performs better.

### Current work

https://github.com/dotnet/maui/tree/foda/CV2

```C#
#if WINDOWS
builder.ConfigureMauiHandlers(handlers =>
{
handlers.AddHandler();
});
#endif
```