Add Support for StaggeredGridLayoutManager

[ankitagrawal2411]

please add support for StaggeredGridLayoutManager

[hendrawd]

If you could add support to other LayoutManager(custom LayoutManager that extends RecyclerView.LayoutManager) as well, it will be useful

[turing-tech]

The problem is that the library needs to be able to tell how far down an item is based on its position, and there isn't a good way to do that outside of linear and grid views. I'll look into implementing a custom interface that LayoutManagers could implement to provide that information.