RFC: add waitForTimersAndIntervals

[kellyselden]

After reading emberjs/ember.js#3008, I think I understand it as Ember.run.later blocks and setTimeout doesn't block wait(). My scenario is a library I'm using is using setTimeout (here), yet I still want my wait() call to block.
I whipped this code up quick to test it out and it works as expected. The implementation is probably terrible. I just wanted to start a conversation.

[kellyselden]

BTW, I'm also tackling this problem from a different angle here machty/ember-concurrency#55

[Turbo87]

I'm a little worried about overwriting the native functions like this. @kellyselden is this still a relevant to you?

[kellyselden]

@Turbo87 It's still being successfully used here. I'm not sure if there has been a better way discovered of how to do this.

[rwjblue]

I'm pretty uncomfortable with monkey patching setTimeout & co. I think an addon can easily do this and leverage the new ember-test-waiters to provide the waiting experience.

Going to close this in favor of that path forward....