drag items with dragula

I'm using [dragual.js](https://github.com/bevacqua/dragula) for dragging items.
So I don't want use draggabilly too.
Is it possible to bind dragula too?

@desandro

Thanks

The issue asks whether Packery can use dragula.js for dragging instead of draggabilly, but names no files, tests, or entry points. Start by locating Packery's current dragging integration and documentation, then determine the required compatibility work; done would mean a supported, documented Dragula binding or a clear decision that it is not supported.

Written by the indexing model from the issue text.