title: DiffUtils vs stable Ids in recycler view
body: <p>I have been reading a lot about the optimisations in RecyclerView
   for quite some time and have learnt a lot of new concepts. One thing that isn't still clear is that can we use both stable ids and DiffUtils together in a RecyclerView. Are there possible benefits/drawbacks of this approach? From what I have read, I think using DiffUtils alone will give all the possible benefits of the reuse of viewHolders and nice animations(correct me if I am wrong). A detailed comparison would be really helpful. </p>