[w3c/webcomponents] [idea] Expose and API for syncing attributes and properties (#823)

There should be a built-in mechanism for keeping custom element attributes and properties in sync. This is currently only possible using getters/setters and potentially problematic logic in the `attributeChangedCallback.` Doing this would remove the amount of necessary boilerplate code and potentially clear up some of the confusion in the wild about the differences between attributes and properties on HTML elements.

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https://github.com/w3c/webcomponents/issues/823