provide named exports for all builtin libraries so that the libraries may be
imported in a nicer way for esm users: import { readFile } from 'fs'
instead of importing the entire namespace, import fs from 'fs', and
calling fs.readFile. the default export is left as the entire
namespace (module.exports)

continuation of #18131 because it got too long and github was giving unicorns

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines