BHV-13297: Integer picker width changes slightly with every change in number

### Issue:
 integer picker width changes slightly with every change in number
### Fix:
create minWidth property, which sets the min-width css property of the picker, and then set minWidth to an appropriate value in the sample, given the range.

Enyo-DCO-1.1-Signed-off-by: Krishna Rangarajan <krishna.rangarajan@lge.com>
Is it really necessary to create a published property that directly maps to a CSS property? We don't (generally) do this for properties, right? Seems reasonable to me to put the onus on the dev to set a min-width css property if they don't like the changing width. Could create a LESS var if it was warranted