[ic-data-table]: Add sort event documentation to guidance site

[jd239]

What component is this related to?

ic-data-table

Why do we need it?

New functionality which allows consumers to send sorting data to a back-end needs to be shown as an example in the guidance site.

Related open issues

https://github.com/mi6/ic-ui-kit/issues/2179

[ad9242]

there is a sortable example already on the site. this could be extended and\or copied to show the event being used