partly Closes #23075 

Release Notes:

- Now provides collapse and enables functionality to outline entries
- Add a new expand_outlines_with_depth setting to customize how deep the
tree is expanded by when a file is opened

part 2 is in #34164 

**Visual examples**

![image](https://github.com/user-attachments/assets/5dcdb83b-6e3e-4bfd-8ef4-76ae2ce4d3e6)

![image](https://github.com/user-attachments/assets/7b786a5a-1a8c-4f34-aaa5-4a8d0afa9668)

![image](https://github.com/user-attachments/assets/1817be06-ac71-4480-8f17-0bd862e913c8)