[PoC] support inline/nested records inside of externals

[zth]

Closes https://github.com/rescript-lang/rescript/issues/7386

Mostly a PoC for now, to see if it was possible to just extend the current mechanisms to this. Feedback appreciated. There are still issues to solve, but this serves as a base for discussion/experimentation.

Support inline record definitions in externals:

@module("node:fs")
external readFileSync: (
  string,
  ~options: {
    encoding?: [#utf8 | #ascii | #base64],
    flag?: string,
    misc?: {
      mode?: int,
    },
  },
) => option<{filename: string, size: string}> = "fs.readFileSync"

[zth]

cc @nojaf

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commit: 9eaa9be

[tsnobip]

This would make writing bindings so much easier!!

[nojaf]

Beautiful! Ship it!