<DataTable> Allow for nested tables

[jocelyn-dunkley]

Is your feature request related to a problem? Please describe.

Pacman team recently released what we call "product list expanded variant table". Essentially using custom CSS to add a nested table within the DataTable. Customers have really liked this new feature. I think there are a couple other teams on the MC who has been interested in having something like this as well.

Describe the solution you'd like A clear and concise description of what you want to happen.

Essentially what we built in the product list but natively in UI-kit. There's a couple small UX issues we can't fix due to the hacky-ness of our solution.

Additional context

### Tasks

[ddouglasz]

Hello @jocelyn-dunkley Thank you for reporting this issue. We will take a look at this up and update you on how we plan to proceed.