[whatwg/webidl] Add disposer and async_disposer (PR #1488)

An intial draft at adding the `disposer` and `async_disposer` keywords to declare that an interface implements `Symbol.dispose` and `Symbol.asyncDispose`:

```
interface Foo {
  disposer;
  async_disposer;
}
```

```js
using foo = new Foo();
await using foo = new Foo();
```

- [ ] At least two implementers are interested (and none opposed):
   * Node.js
   * Cloudflare Workers
   * ...
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * … <!-- If these tests are tentative, link a PR to make them non-tentative. -->
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno: …
   * Node.js: …
   * webidl2.js: …
   * widlparser: …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
- [ ] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)


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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1488

-- Commit Summary --

  * Add disposer and async_disposer

-- File Changes --

    M index.bs (154)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1488.patch
https://github.com/whatwg/webidl/pull/1488.diff

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