Add `.toMatchSnapshot()` (#48029)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48029

Changelog: [Internal]

Adding snapshot support for rendered output only for now.
This will only work if snapshot is created beforehand by hand.

# Next steps
* Create snapshot when no prior snapshot is available
* Pass and update if instructed

Reviewed By: christophpurrer

Differential Revision: D66601387

fbshipit-source-id: fe528cded43c5ba36d314bd9af8e3fb84b98ac3e