[React Dashboard] Make built in list views more customizable or at least replaceable

[SebastianSander]

Since i do not want to overwhelm our backoffice with all the different columns, order states, etc etc having the list views more customizable would be very helpful. another option would be allowing us extension routes on eg /orders.

right now imo the dashboard's router assembly explicitly skips any extension route whose path collides with a built-in —
if (authenticatedRoute.children.findIndex(r => r.path === 'orders') > -1) continue;.
So an extension route at /orders is ignored; the built-in always wins. no override.