[FEATURE] Perspective Tag Browse Tree - Allow root to be set to UDT Definitions

I would like to use the tag browse tree to show UDT definitions, but specifying [default]_types_ yields no results. I see no mention of UDT defs in the user manual, so I'm guessing this hasn't been allowed for.

This would likely require a prop to be added to enable showing UDT definitions, otherwise a blank or root tag provider path would show both standard tags and UDT definitions, with no way to not show the UDT defs.