[whatwg/fullscreen] Missing tasks in parallel steps in Fullscreen API Standard (Issue #240)

While crawling [Fullscreen API Standard](https://fullscreen.spec.whatwg.org/), the following algorithms fire an event, or resolve or reject a Promise, within a step that runs [in parallel](https://html.spec.whatwg.org/multipage/infrastructure.html#in-parallel) without first queuing a task:
* [ ] The [requestFullscreen(options)](https://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen) algorithm resolves/rejects a promise directly in a step that runs in parallel
* [ ] The [exit fullscreen](https://fullscreen.spec.whatwg.org/#exit-fullscreen) algorithm resolves/rejects a promise directly in a step that runs in parallel

See [Dealing with the event loop](https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-for-spec-authors) in the HTML specification for guidance on how to deal with algorithm sections that run *in parallel*.

<sub>Cc @dontcallmedom @tidoust</sub>

<sub>This issue was detected and reported semi-automatically by [Strudy](https://github.com/w3c/strudy/) based on data collected in [webref](https://github.com/w3c/webref/).</sub>


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