Blog entry for new JSPI API

[fgmccabe]

A new blog post talking about some changes to JSPI including the new API

[tomayac]

Many minor suggestions to (hopefully) improve the article.

One question that I think you should answer: how can this be feature-detected? It seems like the below could work:

// Old API:
'Suspender' in WebAssembly

// New API
'promising' in WebAssembly

[fgmccabe]

@tomayac In response to the feature detection question.
It would be good to have something about feature detection. Since I am planning to update the original article, I will add it to that one.

[tomayac]

@tomayac In response to the feature detection question. It would be good to have something about feature detection. Since I am planning to update the original article, I will add it to that one.

The reference blog post should have an evergreen feature detection method mentioned, and this new blog post should half a way to tell which of the two JSPI API versions the current browser supports.

[fgmccabe]

I see. Yes, I will try to craft something along those lines.

[tomayac]

LGTM with one final nit suggestion for the description.