[Feature Request] VRadioGroup/VRadio missing active-class prop

[vexleet]

Problem to solve

Apply styling to the currently selected radio button.

In Vuetify 2, .v-item-active or the value of the active-class prop was automatically added to VRadio elements when selected. In Vuetify 3, this is no longer the case as far as I can tell, nor is the new prop selected-class present.

Copy from #17539, because it seems no action was taken and the request is the same.

Proposed solution

Add the v-item-selected class to the VRadio component and allow choosing the class name with the selected-class prop, in order to be consistent with other components.