INotifyCollectionChanging

[tibel]

Check if creating and implementing INotifyCollectionChanging makes sense

• add INotifyCollectionChanging interface
• with RegisterCollectionChangingWeak() helper method
• dotnet/runtime#34140
• dotnet/runtime#18087
• https://github.com/dotnet/runtime/blob/main/src/libraries/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs
• https://github.com/DustinCampbell/SimpleMVVM/blob/master/Source/SimpleMVVM/Collections/BulkObservableCollection.cs