Updated TreeView Implementation for .Net9 using CollectionView

[mos379]

@enisn due to the problems with performance(#436) and layout issues(#813,#457) using the Binding Layout I created a new implementation based on your code and would love to get your feedback and possible integration into your package!
All code is shared here in my public repo

I created new classes so it is easier to compare and decide if this should be additional or later relace your current implementation.

[mos379]

@enisn Any chance to have look at this?
I could create a PR but would need to know which approach You would prefer.

[mos379]

@enisn :)

[mos379]

#873