nightly-2024-07-18: feat: LSP document symbol (#5532)

# Description

## Problem

Resolves #5533

## Summary

With this you can see where you are at any time, and jump to any symbol
in the document.



https://github.com/user-attachments/assets/74ebdb36-cd51-4afc-a33e-775156c1317b




## Additional Context

None

## Documentation

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist

- [x] I have tested the changes locally.
- [ ] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.