Should containers implement AsyncDisposable?

[nikeee]

AsyncDisposable is a new interface defined like that:

interface AsyncDisposable {
    [Symbol.asyncDispose](): PromiseLike<void>;
}

If a class implements AsyncDisposable, it can be used with using. It automatically disposes the resource if the scope exits, even if there was an exception:

// container class implemeting:
class FooContainer extends GenericContainer implements AsyncDisposable {
    [Symbol.asyncDispose](): PromiseLike<void> {
      this.stop();
    }
}

// usage:
await using container = new FooContainer().start();
// ... testing ...
// oopsie, an exception was thrown
// ...
// container.asyncDispose()  will be called regardless
// no dangling container left behind

If the user doesn't use await using, everything behaves like it always had. So this wouldn't be a breaking change, just
offering the ability to guarantee stopping the container.

TC39 spec, TS support

[cristianrgreco]

#1080