[Feature] Show imported targets and their properties in the debugger

### Request Overview

Imported targets don't show up in the debugger, so there's no way to inspect their properties except by modifying the CMake script to add `get_target_property` and `message` calls.

I tried to do a quick background check to see whether CMake exposes this information to debuggers, and this plugin doesn't consume it, or whether CMake doesn't expose it and I need to redo this feature request on Kitware's tracker, but I didn't find anything definitive, so sorry if this is the wrong tracker.

### Additional Information

_No response_

Start by determining whether CMake exposes imported targets and their properties to debuggers, then inspect how this plugin consumes debugger information. Done means imported targets appear in the debugger with their properties available for inspection, without requiring get_target_property or message calls in the CMake script.

Written by the indexing model from the issue text.