feat(transpile): Support fixed length lists

[yannbolliger]

Closes #1240

Adds support for Fixed Length Lists to the transpile.

The (likely wrong) implementations for Fixed Length Lists of gen_flat_lower_fn_js_expr and gen_flat_lower_fn_list_js_expr have not been changed.

[vados-cosmonic]

LGTM 🚀

Excellent work @yannbolliger -- I only had incredibly minor nits, and am happy to merge this as soon as those are addressed.

[vados-cosmonic]

Ah also @yannbolliger we require conventional commits here (I think that's the only test failing), so here are some commit titles that would be good:

feat(bindgen): implement fixed length lists

(for a commit with all the bindgen changes)

test(jco): add tests for fixed length lists

(for a commit with the changes made to jco test and the rust test components

I can make these changes for you if you'd like!

[yannbolliger]

we require conventional commits here

Oh, I thought we were squashing the commits at the end and this only applied to the PR. 👍

[vados-cosmonic]

As weird as this sounds, the cc-commits check does not like capital letters to start the commit title:

fix(bindgen): Make all bindings const