prettyDOM should be able to serialize shadowRoots

Splitting this out from #484 

A `ShadowRoot` is a DocumentFragment node that should be able to be serialized by pretty-format & prettyDOM,

A few changes would be needed in [pretty-dom](https://github.com/testing-library/dom-testing-library/blob/main/src/pretty-dom.js), including removing or altering the check for outerHTML (shadowRoot has innerHTML only) and adding recursive traversal of the node.

- https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType#node_type_constants
- https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot

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prettyDOM should be able to serialize shadowRoots #1188

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prettyDOM should be able to serialize shadowRoots #1188

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