[Feature Request] Add Center Insufficient Slides option

[AndrewBogdanovTSS]

I want to have a property that would center my slides within a slider container if the total width of the items is smaller than a parent container width. Although it's currently possible with writing a bunch of external CSS - I don't feel this as the right solution to use. Such a feature should be available via a slider option Example: https://take.ms/50yJT