[FR] Support for docstring blocks folding

### Feature description

Collapsing all the folds in lua in my case still leaves some huge docstrings not folded, it would be very handy to get these folds by default as well 

### Describe the solution you'd like

<img width="3840" height="1993" alt="Image" src="https://github.com/user-attachments/assets/535c74c8-ae02-4eb7-86c3-696dd97c46a5" />

### Additional context

_No response_