feat: couple refs to outer application DOM elements

[andy-haynes]

This PR adds support for invoking DOM methods on outer application elements, supporting useRef cases such as:

import { useEffect, useRef } from 'react';

export default function() {
  const input = useRef(null);
  useEffect(() => {
    input.current.focus();
  }, []);

  return <input ref={input} type="text" />;
}

When refs are found on rendered Components (starting with the initial render), they are replaced with proxy objects that post messages to the outer application to invoke the DOM method on that node's corresponding outer application DOM element.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
bos-web-engine	❌ Failed (Inspect)			Apr 12, 2024 6:38pm
bos-web-engine-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 12, 2024 6:38pm
bos-web-engine-sandbox	❌ Failed (Inspect)			Apr 12, 2024 6:38pm

[andy-haynes]

Failing tests/deployments are because I merged an unrelated issue fix with #410 to unblock the last commit