feat(vscode): adding NL outlines generation experimental feature

[Sma1lboy]

Task List

• [x] Moved NL outlines generation to the VSCode extension
• [x] Added functionality to generate NL outlines for the visible range without selection
• [x] Next step: Remove NL outlines generation code from the LSP server
• [x] After completing the Edit functionality, regenerate the code for the section below
  • Now it could generate new code base on old content. but the view style needs to change;

Example:

Example for visible range with offset https://jam.dev/c/d299e35d-7442-4924-9f1c-dee7b430a6c5