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add combineLatestOrDefault operator like combineLatest but suited for providers

Warren Gifford requested to merge combine-operator into master

Created by: sqs

The new combineLatestOrDefault RxJS operator is like combineLatest, with a few differences in behavior that make it suitable for "getting results from providers":

  • it does not block on the slowest provider before making its first emission (outcome: users perceive the app is slow)
  • it never completes if the source observables array is empty (outcome: easy to make a mistake here and forget to check for array length === 0)

This replaces a workaround for the first issue that was merged in #1259. It removes hackiness and flakiness (arbitrary sleeps) from the tests that that hack required.

There is no expected behavior change for users in this PR.

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