add support for the Flix programming language

[fidelicura]

Flix is a very expressive and powerful effect-oriented programming language, targetting JVM. It has a growing community (2.3K 🌟) and big sponsors. It already has a support for Visual Studio Code with 1:1 correspondence, a built-in LSP, REPL and a package manager. I think it would be cool if Helix added support for this programming language. What do you think? How difficult would it be?

[emilycares]

There seems to be no usable tree-sitter grammar at this point. So that would be a first step.
There are two repository's but they are not usable today.

• https://github.com/omarjatoi/tree-sitter-flix (not grammar)
• https://github.com/herluf-ba/tree-sitter-flix (not done)