Most RecyclerViewActions are given a matcher to select a particular view / viewholder within
the RecyclerView. In this case the default behaviour is to expect that the matcher matches 1
and only one item within the RecyclerView.
This interface gives users the ability to override that type of behaviour and explicitly
select an item in the RecyclerView at a given position. This is similar to on the
onData(...).atPosition() api for AdapterViews.