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[Enhancement] Support Cloning Custom Elements (#129)

* feat(custom-elements): ✨ obtain children of shadow node for custom elements

Inspired by https://github.com/tsayen/dom-to-image/pull/370

If element has `shadowRoot` property it is custom
(and the shadow node is open) so fetch it's children.

Closes #128

* fix: 🐛 add safety checks to support special/custom elements

Introduced by 021f124
Access to shadow node exposes the code to custom elements that break the current code.
Was breaking because of elements without a style node.
This commit fixes these bugs with simple, NON-BREAKING safety checks.

* test(htmltoimage): 🚨 Added tests covering custom elements

renders mathfield custom element
https://github.com/arnog/mathlive

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