[Feature]: A card for the shopping_list integration

[lscheibel]

Is your feature request related to a problem?

I don't think the current shopping-list card fits the mushroom theme:

Describe the solution you'd like

I would like a card for the shopping_list integration which visually matches mushrooms style. Something like this:

Describe alternatives you've considered

I've considered using a custom theme however this does not allow for the icon + title + state combo which is common in mushrooms components.

Additional context

I have already created the component and submitted it as a PR #735 :)

[AlessandroTischer]

Amazing work. Hope this will be merged soon!