Admin form support to add reverse_charge_status

Updated the store form for reverese_charge_status
user can select the charge status from the dropdown for the store

Author: JustShah

backend/app/views/spree/admin/stores/_form.html.erb

@@ -30,6 +30,15 @@
       <%= f.text_area :meta_description, class: 'fullwidth' %>
       <%= f.error_message_on :meta_description %>
     <% end %>
+
+    <%= f.field_container :reverse_charge_status do %>
+      <%= f.label :reverse_charge_status %>
+      <%= f.select :reverse_charge_status,
+        Spree::Store.reverse_charge_statuses.keys.map { |key| [key.humanize, key] },
+        { include_blank: true },
+        { class: 'custom-select fullwidth' } %>
+      <%= f.error_message_on :reverse_charge_status %>
+    <% end %>
   </div>
   <div class="col-12 col-md-6">
     <%= f.field_container :url do %>