Add debug method

[Gpx]

Describe the feature you'd like:

When I'm writing my tests I often find myself in a state when I need to know what's going on on the page. To accomplish this I usually write something like this: getByText('something that for sure is not on the page'). This way I have an error and the HTML is shown. I think it would be useful to expose a debug method that does more or less the same thing.

Suggested implementation:

I guess we can reuse the same code used to show error messages

Describe alternatives you've considered:

I tried to console.log(container.innerHTML) but it's all on the same line and hard to follow.

Teachability, Documentation, Adoption, Migration Strategy:

[kentcdodds]

🎉 This issue has been resolved in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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