Added new role for moderator to Groups

• Added:
- new role for moderator to Groups

app/presenters/group_relationships_presenter.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class GroupRelationshipsPresenter
-    attr_reader :member, :admin
+    attr_reader :member, :admin, :moderator
   
     def initialize(group_ids, current_account_id, **options)
       @group_ids          = group_ids.map { |a| a.is_a?(Group) ? a.id : a }
@@ -9,6 +9,7 @@ class GroupRelationshipsPresenter
   
       @member       = Group.member_map(@group_ids, @current_account_id)
       @admin        = Group.admin_map(@group_ids, @current_account_id)
+      @moderator    = Group.moderator_map(@group_ids, @current_account_id)
     end
   end