Fix: Fix module not working on Deno

[sevenc-nanashi]

The written .mjs file does not work on Deno, so I fixed that.

• Use node:module instead of module, so Deno can import that.
• Added polyfill of Buffer.

[sbc100]

We currently don't claim any deno support, but I suppose we could / should. I guess that means we should add at least some basic testing under deno.

Do you know if this incompatibility is likely to persist in deno or might they be looking to increase node comparability? Perhaps we could persuade them using this issue? :)

[kripken]

+1 for @sbc100 's hope that this can be fixed on the Deno side. But if that can't be done, or if we want something to work in the meantime, then I would recommend we look into the approach in #12203 , which I think will scale better if we want Deno, Bun, etc. etc. support. In that idea, each target, like Deno, would have a JS file to include which then patches things up for it. (If we can't literally patch in a polyfill manner, we could do something else, while keeping the goal of avoiding adding code for Deno in builds that don't need Deno.)