Add customizable user roles (#18641)

* Add customizable user roles

* Various fixes and improvements

* Add migration for old settings and fix tootctl role management

app/controllers/admin/ip_blocks_controller.rb

@@ -29,6 +29,8 @@ module Admin
     end
 
     def batch
+      authorize :ip_block, :index?
+
       @form = Form::IpBlockBatch.new(form_ip_block_batch_params.merge(current_account: current_account, action: action_from_button))
       @form.save
     rescue ActionController::ParameterMissing