Drag-and-drop example using Litho

[conca]

I'm trying to implement drag-and-drop using DataDiffSection, but it doesn't work properly. In general, I'm able to drag items within the RecyclerView. However, the interaction feels a bit weird.

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[adityasharat]

@conca can you sign the CLA, that would enable me to pull this PR into our source control.

[conca]

Sorry for the delay. I totally missed your message. This was just an example of drag-and-drop (that is actually not working as expected) for Pasquale to check and identify what is wrong. Do you still need the signature?