Add Haskell Language Server

[Ailrun]

HLS is the project collecting most of the manpower for Haskell IDE backend development. It supports LSP, and I saw that the README.md of this repository mentions LSP server, so I wrote this issue. Is it possible to add HLS as a IDE backend of repl.it editor? If that's possible, it would be awesome.

[ALANVF]

Yes that sounds like it could happen!

[Ailrun]

If I add HLS to https://github.com/replit/polygott/blob/master/languages/haskell.toml (and wait some time?), does that work for Repl.it editor for Haskell? If not, what should I do to add the support?

[ALANVF]

Yes it should theoretically work