Lazy/Dynamic Loading Examples

[JennaEllis]

This module works great, it just puts a strain on limiting new dependencies and bundle size for some react projects.
It seems like a common use case to lazy load this component as well as any other references to the react-sortable-tree package (the utility functions as well as the FileExplorerTheme); if possible, could we update the documentation to include some official examples on lazy and dynamic load cases?

Thanks!