Implement Sub Groups for the Menu

[Ilgmi]

Add divider

{
  id: 'main-menu-divider-admin',
  title: this.$t('drawer.section.admin.title'),
  divider: true,
  visible: true
},

Menu with Sub

{
  id: 'main-menu-button-admin',
  title: this.$t('drawer.section.admin.title'),
  icon: 'mdi-shield-account-variant-outline',
  group: '/admin',
  subGroup:true,
  text: true,
  visible: this.userStore.userRoles.includes('slm-admin'),
  children: [
    {
      id: 'main-menu-button-admin-components',
      title: this.$t('drawer.section.admin.components.title'),
      icon: 'mdi-shield-account-variant-outline',
      to: 'components',
      visible: this.userStore.userRoles.includes('slm-admin'),
    },
  ],
  },