Add pyright/eglot config for emacs

[pakelley]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• [N/A] Test cases added for changed code.

Describe what you have changed in this PR.

MS's python lang server (as well as lsp-python-ms) are archived in favor of pyright. Additionally, eglot will be packaged with Emacs once Emacs 29 is released.

[pakelley]

Adding a news fragment now...

[pakelley]

Also, I'm curious why Emacs's config is in a different section than all of the other editors? If it's arbitrary I'd be happy to move it.

[pakelley]

Sorry for the noise, but the config listed for Neovim works for Emacs too. If it seems helpful, I could add a note about doing it that way to the Emacs section, since it may be simpler in some cases.

[frostming]

@pakelley I am not an expert of emacs and I have no objections about the changes.

[pakelley]

Sounds good, well if you don't mind I'll move the emacs section next to the other editors and add a section about configuring via pyproject.toml.
Thanks for all of your work on pdm, it's the first python package management tool I've used that isn't painful :)

[pakelley]

Alright, as long as you're happy with this, I've made all of the changes I wanted. Let me know if there's anything you'd like updated.

[frostming]

LGTM