Styles missing for AdwToggleGroup

[ztefn]

Elementary runtime 8.2 based on GNOME 48 includes libadwaita 1.7 which introduced AdwToggleGroup:
https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/class.ToggleGroup.html

Current elementary stylesheet lacks styles for this widget. Below an example dialog containing AdwToggleGroup for switching between IPv4/IPv6 priority, showing how it looks like using elementary stylesheet and what it supposed to look like.

Elementary stylesheet (unstyled)

Adwaita