Function ExtractSymbols 

pub async fn ExtractSymbols(
    file_path: &PathBuf,
    content: &[u8],
    language: &str,
) -> Result<Vec<SymbolInfo>>

Extract symbols from code for VSCode Outline View and Go to Symbol

Supports multiple programming languages:

• Rust: struct, impl, fn, mod, enum, trait, type
• TypeScript/JavaScript: class, interface, function, const, let, var
• Python: class, def
• Go: type, func, struct, interface