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fix (event processor) [OASIS-5907]: stop promise tracks in-flight dispatcher requests (#397)

Summary:

Add tracking functionality to EventProcessor for every request sent by its dispatcher. This is implemented in a RequestTracker class.
RequestTracker exposes a method (onRequestsComplete) to get a Promise that fulfills after the completion of requests in-flight at the time of the call.
stop is updated to return the promise from RequestTracker onRequestsComplete.

Test plan:

- New and existing unit tests
- Manually tested in browser, Node, & Lambda environments

Issues:

https://optimizely.atlassian.net/browse/OASIS-5907

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