[w3c/webcomponents] changing slot text node is overly verbose (#753)

API wise, including text in a slot seems a lot nicer than using an attribute. 
e.g.
`<copy-paste>lorem ipsum</copy-paste>`
is preferable to
`<copy-paste text="lorem ipsum"></copy-paste>`

However, if the user of the custom element then wants to programmatically change the text, the only way seems to be the ultra-verbose `document.querySelector('copy-paste').shadowRoot.querySelector('slot').assignedNodes()[0].data = 'something completely different'`

The `slotchange` event does not fire when this change occurs, so I guess the only way to monitor the change is with MutationObserver? (which again feels like an OTT solution)

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