feat(jest-transform): expose TransformerFactory type

[ahnpnl]

Summary

This would allow to do this:

import type { TransformerFactory } from '@jest/transform';

const transformer: TransformerFactory = {
    // User will get type hint from `TransformerFactory`
    // ... implementation
}

Test plan

Green CI

[SimenB]

👍

Why draft? 😀

[ahnpnl]

now it's no longer:)

[SimenB]

https://github.com/facebook/jest/releases/tag/v29.0.2

[github-actions]

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