LSP Support for Elm

[mikayla-maki]

Check for existing issues

• [X] Completed

Describe the feature

https://github.com/elm-tooling/elm-language-server

If applicable, add mockups / screenshots to help present your vision of the feature

No response

[w0rm]

:wave:

@absynce and I are trying to make it work with some help from @razzeee, the maintainer of elm-language-server.

The basic integration seems to be working fine, just need to fix some errors and propagate configuration options.