Explore using arrayvec/arraystring crate for stack allocated strings

[numinnex]

Since our strings (for identifier etc..) are fixed size, we could easily move the allocation from heap to the stack. Rust doesn't have std lib support for such things, but fortunately a crate that solves that problem https://crates.io/crates/arrayvec

[BenFradet]

I can have a look at this one 👍

[numinnex]

That would be great, since it's only a proposal and we would like to discuss this further on github discussions, for now I would choose one struct from our codebase, for example Identifier and try plugging it there.

[BenFradet]

sounds good, will open a draft pr once I'm done to further advance the discussion