Export `withMessage` for manual patching

[Helveg]

Not all testing setups are born equal. Some are fidgety, and import 'jest-expect-message' does not successfully apply the patch. It would help if withMessage was exported, perhaps as patchJestExpectWithMessage, so that I can apply the patch myself.

Currently I have to do this in my setupAfterEnv:

// @ts-ignore: ignore withMessage missing from declarations
import withMessage from 'jest-expect-message/dist/withMessage.js';

// @ts-ignore: patch jest expect
global.expect = withMessage(expect);

which is fine 🤷 Could perhaps also a expectWithMessage function be added that instead of monkey-patching the expect function simply calls it with the wrapping logic applied once?