Feature proposal: search, ignore comments

**Feature request**
It would be cool if slither-vscode could provide a better search experience than native vs code. E.g. ignore comments or even ignore any non-executable code (comments and strings).

E.g. searching `new ` on my codebase (to identify which contracts are factories) yields about 20 results, but only two are relevant

(Adding this here bc it is not (yet) part of LSP spec)