Support for AsyncIterator

Occasionally an API requires the use of a JavaScript async `for` over some iterator like this:

```javascript
for await (const [key, value] of this.keyv.iterator()) {
console.log(key, value); // Return: key and value
};
```

It would be neat if there was a way to do this directly in promesa, similar to the macro at [How to work with asynciterable](https://ask.clojure.org/index.php/10896/how-to-work-with-asynciterable-interface-in-cljs). Here's the macro:

```clojure
(defmacro async-doseq [[binding async-iterable] & body]
`(let [async-iterator# ((js* "~{}[Symbol.asyncIterator]" ~async-iterable))]
(fn handle-next# []
(let [next# (.next async-iterator#)]
(.then
next#
(fn [res#]
(if (.- res# done)
nil
(do (let [~binding (.- res# value)]
~@body)
(handle-next#)))))))))
```

Is this something Promesa is interested in supporting?

Start by reviewing Promesa's existing asynchronous API alongside the linked async-doseq macro and the JavaScript AsyncIterator example. The issue names no files or tests, so first locate the relevant iteration and promise entry points; done should be defined as documented support for consuming an async iterable with clear completion semantics and coverage for the intended usage.

Written by the indexing model from the issue text.