feat(ctx): Add "ctx.forward" for forwarding requests

[lsroa]

This tries to solve the discussed here #676 @kentcdodds @kettanaito
Probably the test needs some improvements 🤔

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[kentcdodds]

I tried this locally and it doesn't work I'm afraid. The res is just this:

{
  status: 200,
  statusText: 'OK',
  body: null,
  delay: 0,
  once: false,
  headers: HeadersPolyfill {
    _headers: { 'x-powered-by': 'msw' },
    _names: Map(1) { 'x-powered-by' => 'x-powered-by' }
  }
}

It's basically an empty response. I'm not sure where the issue is, but this won't work as it is today I'm afraid.

[kettanaito]

Hey, @lsroa. Thank you so much for your work on this feature. I've decided to go with #1204.

[kettanaito]

Released: v0.40.0 🎉

This has been released in v0.40.0!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i msw@latest) to get the newest features and bug fixes.

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