feat(babel-jest): export createTransformer function

[nwalters512]

Summary

Fixes #11444 by adding a named export of createTransformer to the babel-jest package. This allows Jest users to do the following:

import { createTransformer } from 'babel-jest';

export default createTransformer({
  // ...
});

[SimenB]

Right, should have done this when migrating to ESM in #11193.

Thanks!

[github-actions]

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