Add basic group member list page

src/components/layout/AppRouter.tsx

src/components/pages/GroupListPage.tsx

src/components/pages/GroupManagementPage.tsx

src/components/widgets/group/GroupList.tsx

src/components/widgets/group/GroupListItem.tsx

src/components/widgets/group/UserList.tsx

src/components/widgets/group/UserListItem.tsx

src/constants.ts

src/data/schemas.ts

src/icons/ChevronDown.svg

src/utils/utils.ts