Scala.js binding generator

I have implemented a Scala.js binding generator in my fork (https://github.com/vigoo/wit-bindgen-scalajs/pull/1) which genreates Scala code that, when compiled with Scala.js, produces JS code compatible with jco/componentize.js

Is this something that could be merged to the official `wit-bindgen` codebase? If yes, I will open a pull request.

(Otherwise I'm going to publish the fork as a separate binding generator CLI only for scala.js)

Start by reviewing the linked fork and its pull request to understand the Scala.js binding generator and the generated code's compatibility with jco/componentize.js. Compare that work with the official wit-bindgen contribution expectations. Done means maintainers decide whether the generator belongs in this codebase and, if so, the contributor opens a pull request.

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