Use jedi behind a language server protocol

[kimadeline]

It should be possible with minimal pain according to Karthik Nadig (@karthiknadig).

Also, check out 👉 https://github.com/pappasam/jedi-language-server/blob/master/jedi_language_server/server.py 👈

Things to do before enabling this:

• Ensure help tool tip supports markdown Improve intelligent code snippet prompt and parameter prompt of pytorch module with Jedi  #12179 (comment)
• Remove pylint minimal checkers VS Code does not honor pylint pyproject.toml file under default settings #13321