feat(wrapWithHits): enable async init

[samouss]

Summary

This PR enable the possibility to init the story asynchronously. It can be useful for preload some assets before adding a widget without loading it for all the stories (ex: Google Maps).

Result

We can now call wrapWithHits with a function of one or two arguments. One argument means that il will be synchrone, two arguments means asynchronous. The second argument is the start function.

// sync
wrapWithHits(container => {
  window.search.addWidget(
    instantsearch.widgets.hits({
      container: "#hits"
    })
  );
});

// async
wrapWithHits((container, start) => {
  window.search.addWidget(
    instantsearch.widgets.hits({
      container: "#hits"
    })
  );

  start();
});

[algobot]

Deploy preview ready!

Built with commit 75ec46d

https://deploy-preview-2635--algolia-instantsearch.netlify.com

[samouss]

#2633 must be merged before, because the current SauceLabs token has probably be revoked.

[bobylito]

Good new feature 👍