Allows to search for sort_name OR display_name when searching for the contact name. Works both in generic search (Search -> Search contacts) as well as quick search.
The reason for this extension is to be able to search for a contact's full name when sort_name is {contact.last_name}{, }{contact.first_name}.
For more details see: https://lab.civicrm.org/dev/core/-/issues/2946