feat(request): enable requests to be awaited upon

[JasonBerry]

This will enable being able to await on events being sent.

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[wwalser]

My initial intuition was that we should provide the conventional Node interface and offer the ability to pass a callback but that would break the strict polymorphic type cohesion between node and browser versions of the library.

This looks correct. Have you manually tested that the code form the ticket executes as expected now? https://algolia.atlassian.net/browse/CR-3696?focusedCommentId=316055

[wwalser]

LGTM

[JasonBerry]

Have you manually tested that the code form the ticket executes as expected now?
I eyeballed the code from the ticket and it looks fine, but it just really irked me that there was no way for customers to write something effective using our insights library and we can do better.