feat: support for importModule in api.transform

[chenjiahan]

Summary

This is the same as Rspack's loaderContext.importModule.

const myPlugin: RsbuildPlugin = {
  name: 'my-plugin',
  setup(api) {
    api.transform({ test: /\.css$/ }, async ({ code, importModule }) => {
      const { foo } = await importModule(join(__dirname, './src/foo.ts'));
      console.log('foo', foo);
      return code.replace('red', foo);
    });
  },
};

Documentation will be added later as Rspack also lacks the documentation for this API.

Related Links

#4186

Checklist

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

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