Apply default sort order column and direction

[simple-hacker]

Apply a default sort column and direction to the datatable.

Add the following to the datatable as properties. For example, to order by latest you should

public string $defaultSortColumn = 'created_at';
public string $defaultSortDirection = 'desc';

This order by will only apply if $defaultSortColumn is not empty, and no other column is being sorted. i.e. $this->sorts is empty.