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Report or Reject when encountering Errors.

Currently the `subscribe()` function throws Errors, however this is awkward when used along with async functions which would expect a rejected iteration to represent failure. Also GraphQLErrors should be reported back to the client since they represent client-provided errors.

Updates test cases to represent this new behavior.

Includes a new utility `asyncIteratorReject`, and extends the behavior of `mapAsyncIterator` to help implement this.

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