Improve CPU overhead of async locks and latency on Windows TLS sendall

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      Improve CPU overhead of async locks and latency on Windows TLS sendall. Related to PYTHON-4603.

      On windows+tls the async api will sleep for 500ms if send() would block the loop. This adds a lot of latency since 500ms is very large. Instead we could use a simple exponential backoff algorithm.

            Assignee:
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            Reporter:
            Shane Harvey
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