Enable on Jupyter notebooks

[salcc]

The extension does not lint .ipynb files.

[marcelmore]

Is feedback other than a "thumbs up" required? Is there a defined threshold above which the feature request will be accepted?

[rd-andreas-lay]

Would be great to have this. I have currently set up my .pre-commit-config.yaml such that notebooks are linted using nbqa:

-   repo: local
    hooks:
     -  id: mypy-jupyter
        name: mypy-jupyter
        entry: nbqa mypy
        language: system
        types: [jupyter]
        require_serial: true

It'd be nice to get linting working directly through the vscode-mypy extension though.

[ninjaguardian]

It would make it so I don't have to move my code to see if mypy is yelling at me.