Allow rendering the <script> tag in HTML preview

[pomek]

📝 Provide a description of the improvement

Right now, the scripts are being removed because we use the Element#innerHTML property for updating the preview container element.

ckeditor5/packages/ckeditor5-html-embed/src/htmlembedediting.js

Lines 310 to 319 in 64c87e5

	function createPreviewContainer( { domDocument, state, props } ) {
	const domPreviewContainer = createElement( domDocument, 'div', {
	class: 'raw-html-embed__preview'
	} );
	const sanitizeOutput = props.sanitizeHtml( state.getRawHtmlValue() );
	domPreviewContainer.innerHTML = sanitizeOutput.html;
	return domPreviewContainer;
	}

We could parse the HTML string and append a proper structure to the element.

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[wwalc]

I'd consider my case as irrelevant, but I just stumbled upon this problem when I tried to quickly embed a 3rd party library in CKEditor to showcase the potential of widgets.