Improve TypeScript 4.7 NodeNext compatibility

[RobinMalfait]

This PR improves the compatibility of the NodeNext module resolution in TypeScript 4.7.

We already rewrote the imports to include the .js file, but we only did this for generated .js
files and not for generated .d.ts files.

Ideally we don't have to do this rewrite on build files at all, and that is possible if we add the
.js files to the actual source files. However this has some (annoying) issues:

• We then have to make sure that all tooling (Next.js, Jest, ...) works with .js files.
• We will introduce a lot of changes, and this will cause annoying merge conflicts.
• We will have to make sure that we always think about adding the .js file extension in the imports.

Instead, for now, rewriting imports on .d.ts files as we already do with .js file should do the trick,
because then the .js extensiosn will be there in import/export statements.

Fixes: #1699

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