fix(type): rspack function type in cjs require

[SoonIter]

Summary

fix the function type in cjs require

close #8095

// in esm
import { rspack } from '@rspack/core';
rspack({ bail: true });

// in cjs
const rspack = require("@rspack/core");
// or const { rspack } = require("@rspack/core");
rspack({ bail: true });

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[SoonIter]

This is a solution with a little hack.
Maybe we need to ship both cjs and esm in the future.

[chenjiahan]

Maybe we need to ship both cjs and esm in the future.

Agreed, @rspack/core should be a dual package.