<vaadin-grid-sorter> can be used to define sorting for a column.
The users in the example are sorted by last name initially.
NOTE: You must explicitly import the vaadin-grid-sorter in order to use it.
When the data is fetched from a data provider, the responsibility
of providing the correctly ordered data is on the data provider itself.
The data provider is asked for fresh sorted data whenever the sorting
order is changed on any <vaadin-grid-sorter>.
The effective sortOrders array will be included as one of
the data provider call options.
Hint: When using a data provider, path on the
<vaadin-grid-sorter> element can be set to any string,
instead of a property on the item object.