feat: export callbacks for hooks

[ph-fritsche]

What

Export @experimental functions prepare, reset and detach to improve support for different test environments.

import userEvent, {prepare, reset, detach } from '@testing-library/user-event'
import { beforeAll, afterEach, afterAll, test } from 'some-test-runner'
import { DomImplementation } from 'some-dom-implementation'

const window = new DomImplementation()

beforeAll(() => prepare(window))
afterEach(() => reset(window))
afterAll(() => detach(window))

test('something', async () => {
  const user = userEvent.setup({document: window.document})
  // ...

Why

UserEvent should work in various environments. Exposing these functions allows our users to integrate UserEvent in environments that don't use global hooks or global document.

How

Includes a fix to restoreFocus.

Includes a check if globalThis.window exists.

Checklist

• Ready to be merged

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