Focus function should support which input can be focused on in range

[jordanjones243]

General Support Request

Currently, there is a focus() method that forces focus on the first input no matter what datepicker is being rendered. There should be additional logic added to allow implementers to choose which input can be focused on when the range attribute is present.

Possible Solution

Add an optional parameter to the function that will give implementers the ability to call focus onto the second input in a datepicker with range ability

Exit criteria

Either input can be focused on when calling the focus() method