Support for Literate Haskell

[LaurentRDC]

This change adds support for Literate Haskell. Literate Haskell files are basically regular Haskell files, so I kept much of the same configuration as for haskell, for example the root files and comment structure. The tree-sitter support is based on my own repo.

Here's an example of using an example file using hx built from this branch:

export HELIX_RUNTIME=./runtime 
cargo run hx --grammar fetch
cargo run hx --grammar build
cargo run hx

[the-mikedavis]

We typically require a tree-sitter grammar. If the syntax is the same as haskell then you can reuse the haskell grammar. See the docker-compose language for an example of that - it reuses the YAML grammar

[LaurentRDC]

Understood, I'm working on a grammar right now. I'll convert this to a draft until it is ready