Add natspec support

[shuklaayush]

Thanks for this great tool! I was wondering if it makes sense to add support for natspec comments in the grammar. Happy to work on it if needed

Natspec ref: https://docs.soliditylang.org/en/develop/natspec-format.html

[davidhq]

Hi ! Thank you for writing, I agree, this deserves a proper look ... I'll respond a bit more properly within a week or at latest two weeks, I'm exactly at transition between holidays and back to coding etc. if in the meantime you manage to implement a PoC / prepare a pull request or offer any further thought / guidance, welcome to do so, it will be much appreciated ... regards and until soon

[davidhq]

I still plan to do this :) It might move to early next year.