Feature request: LTeX check

[HDembinski]

Thanks for this awesome package, very useful!

I would like to add support for the LTeX language server, which performs spell checking, grammar checking, and style checking on written english text. LTeX supports Markdown and LaTeX, and can be used to automatically check the markdown sections of a notebook. I use it as a VSCode plugin to check scientific documents written in LaTeX and it works very well.

I would also like to implement this feature if you are willing to review the PR. I am a senior Python developer and maintain several libraries here on GitHub which are used in the scientific community. I also contributed major features to scipy and matplotlib.

[MarcoGorelli]

hey - sure, a PR would be welcome