feat: open items management (temp commit)

ajax/backend/OpenItemsList/getUserOpenItems.php

ajax/backend/OpenItemsList/search.php

bin/backend/controls/OpenItems/OpenItems.Total.html

bin/backend/controls/OpenItems/OpenItems.UserRecords.html

bin/backend/controls/OpenItems/OpenItems.css

bin/backend/controls/OpenItems/OpenItems.js

events.xml

locale.xml

settings.xml

src/QUI/ERP/Customer/OpenItemsList/Events.php

src/QUI/ERP/Customer/OpenItemsList/Handler.php

src/QUI/ERP/Customer/OpenItemsList/Item.php