Ability to add custom views to an item

[kennydude]

Hi, I was wondering the possibility of adding additional custom views to the CRUD table view and it seems there's nowhere to hook into this.

https://github.com/orchidsoftware/crud/blob/92f9736d715be852c79e00ab3f1e50447bd9ec02/src/Screens/ListScreen.php#L86

I think roughly here is where a hook would be useful to add additional things such as "View PDF" etc (or whatever makes sense in an application)