Render complex attributes of entries.

**Is your feature request related to a problem? Please describe.**
Currently, complex attributes of entries (e.g. List, Dict) are not supported. "N/A" or "Complex Object" are being shown at the attribute slot.

**Describe the solution you'd like**
Since there is a limited and non-recursive type of complex object, it should be safe to implement a one level collapsable view for List and Dict. A user can expand the view to see the details of the List.

**Describe alternatives you've considered**
No

**Additional context**
No

Start by locating the entry attribute renderer and inspect how unsupported List and Dict values become “N/A” or “Complex Object” in the attribute slot. Implement the requested one-level expandable view for these values, then verify that users can reveal their contents without requiring recursive expansion.

Written by the indexing model from the issue text.