feat(apps): preload app runtime

[JanPokorny]

Preload resources for the app runtime once the app list is loaded. Depends on i-am-bee/bee-usercontent-site#26

[Tomas2D]

Such implementation would cause memory leaks and crash the rendering.

Consider something like this.

useEffect(() => {
  const controller = new AbortController();

  fetch(USERCONTENT_SITE_URL, {
    priority: 'low',
    mode: 'no-cors',
    signal: controller.signal,
  }).catch(noop);

  fetch(`${USERCONTENT_SITE_URL}/meta/preload.json`, { signal: controller.signal })
    .then((response) => response.json())
    .then((preload) => Promise.allSettled((preload?.items ?? []).map((item) =>
      fetch(
        item.url.startsWith('/')
          ? `${USERCONTENT_SITE_URL}${item.url}`
          : item.url,
        {
          priority: 'low',
          mode: 'no-cors',
          headers: {
            Accept: `${item.contentType}, */*;q=0.01`,
            'Accept-Encoding': '',
          },
          signal: controller.signal,
        }
      )
    })
    .catch(noop);

  return () => {
    controller.abort();
  };
}, []);