Column Striping Feature for Tables

[Macinto5h]

Pull request contains the following items that contribute to the feature request in Issue #31457

• Styling for class table-striped-vertical that enables column striping for tables.
• A new Sass variable $table-striped-vertical-order such that the vertical striping order can be customized and deviate from the row striping order.
• Documentation for column striping, along with additional examples added to table variants section.

Fixes #31457

[ffoodd]

Seems great, thanks for tackling this!

I wonder if we shouldn't go with colgroup and cols for this, I think it could be simpler.

Andy thoughts?

[Macinto5h]

@ffoodd sorry I didn't respond to the colgroup comment until now. Leveraging colgroup and col is useful for styling columns that share styling consecutively, but here we are dealing with alternating styling. That approach would end with adding extra markup that would be redundant. Instead, I've simplified the CSS selector :)

[ffoodd]

Fine by me, sorry for the delay!

Regarding col and colgroup you're right, only extra markup for almost the same CSS selector.

Concerning colspan no worry, we don't support rowspan either in .table-striped.

So this is IMHO a very nice addition, thanks a lot!

[mdo]

Renamed the class and squashed everything. Thanks!