[whatwg/dom] downloads.download() should be appear in the API (Issue #1438)

NagayamaToshiaki created an issue (whatwg/dom#1438)

### What problem are you trying to solve?

Downloading a file via JavaScript is au usual thing. For example, you `fetch()` something then download its blob. But how to do it is still cumbersome.

### What solutions exist today?

1. create an `<a>` element.
2. assign attributes; `href`, `download` and so on.
3. fire `click()` event via JavaScript.
4. remove the `<a>` element.

What an ugly, hacky way! Downloading via JavaScript should be easier.

### How would you solve it?

Most browser extensions have [`downloads.download()`](https://developer.mozilla.org/ja/docs/Mozilla/Add-ons/WebExtensions/API/downloads/download) method. Why can't we use this syntax?

### Anything else?

_No response_

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