Add customizable user roles (#18641)

* Add customizable user roles

* Various fixes and improvements

* Add migration for old settings and fix tootctl role management

app/views/admin/roles/_role.html.haml

@@ -0,0 +1,18 @@
+.announcements-list__item
+  = link_to edit_admin_role_path(role), class: 'announcements-list__item__title' do
+    %span.user-role{ class: "user-role-#{role.id}" }
+      = fa_icon 'users fw'
+
+      - if role.everyone?
+        = t('admin.roles.everyone')
+      - else
+        = role.name
+
+  .announcements-list__item__action-bar
+    .announcements-list__item__meta
+      - if role.everyone?
+        = t('admin.roles.everyone_full_description_html')
+      - else
+        = link_to t('admin.roles.assigned_users', count: role.users.count), admin_accounts_path(role_id: role.id)
+        •
+        %abbr{ title: role.permissions_as_keys.map { |privilege| I18n.t("admin.roles.privileges.#{privilege}") }.join(', ') }= t('admin.roles.permissions_count', count: role.permissions_as_keys.size)