Extract classes common across component variants #28

I'd like it if the set of classes common across the variants of a component were pulled into something like a common_classes method. Take PhlexUI::Link, where each of the variants list of classes includes whitespace-nowrap, inline-flex, items-center, justify-center, rounded-md, font-medium, transition-colors, focus-visible:outline-none, focus-visible:ring-1, focus-visible:ring-ring, disabled:pointer-events-none, disabled:opacity-50. If these were broke up I could better see what the actual differences are.