Add Luau parsing

[spxnso]

I’d like to propose adding support for a Luau parser via the @lune/luau built‑in library. Currently, users can compile Luau source to bytecode and load it, but I think expanding the luau module by adding a parser (based on Luau's original parser) would be a great idea.

[CompeyDev]

Although this would be cool, there aren't any ready-made bindings to Luau's parser C++ library, which makes this technically challenging.

There is, however, full_moon, a Luau parser written in Rust, which has two shortcomings:

1. Since it is a external parser not maintained by the Luau themselves, it is bound to sometimes be behind Luau's adoption of new syntactical features.
2. It is quite a big dependency to pull in, and also suffers from performance penalties due to its recursive descent structure.

We would either need mlua to provide bindings (which is unlikely), or need to maintain ones in-house (which is challenging and has a maintainership burden, especially since the parser is in C++, IIRC).

[spxnso]

Indeed, I might give it a try.
I wanted to commit some things but sounds like the owner doesn't review the pull requests.

[CompeyDev]

PRs are indeed reviewed. The maintainer visits this project at a monthly basis to make required changes, review code, and dispatch releases. The only open PR that has been open for a long time is the FFI one, which is because the contributor did not finish implementing it.

[spxnso]

Alright that sucks :(
Thanks