Add language server support for native interactive window

[joyceerhl]

No description provided.

[rebornix]

Right now when we close a notebook with diagnostics, the diagnostics are never cleared due to the flow below

open interactive_1 notebook
open interactive_1#ch00000 markdown
open interactive_1#ch00001 python
open dummy_file_abc.py


close interactive_1#ch00000 markdown, ignore
close interactive_1  remove wrapper for dummy_file_abc.py
close interactive_1#ch00001
    create wrapper, dummy_file_def.py
    next(close, dummy_file_def.py)

[joyceerhl]

@rchiodo, @rebornix and I would really appreciate your review on the initial work we have here. Per this morning's discussion there are still some other issues with clearing diagnostics that we will resolve in a separate PR.

[rchiodo]

Looks good. I think I'd want a unit test to verify the concat stuff in the interactive concat document.

[karrtikr]

I see no testing, do we plan to do it separately, or is it not needed? Otherwise, LGTM.

[karrtikr]

Curious, why are scopes not explicitly declared for these methods? Is it because it means they are public methods by default?

[joyceerhl]

Will add a unit test this week, and there are still some other bugs with diagnostics not being cleared on document close that we will fix up in a separate PR. And yes all class members are public by default, and these methods are also supposed to be public.

[paulacamargo25]

LGTM!