Add the ability to display nested collections within a collection

[Ruslan-Aleev]

Now, if you set the collection type for a resource nested in a collection, the resource disappears from the grid and is displayed in the tree.

It would be convenient if nested collections were also displayed in the collection grid. It might be worth adding a separate setting to the Collection template, or to System Settings.

And in the grid, it is worth somehow separating the Collection from other resources. For example, add a folder icon if the icon is not set in the template, or in some other way.