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SignalFx stats exporter (#903)

* SignalFx stats exporter

This commit implements a stats exporter that sends stats as metrics to
SignalFx (https://signalfx.com). It is modeled on the Stackdriver stats
exporter in that it uses a background worker thread that periodically
inspects all the views and constructs datapoints to send to SignalFx for
their corresponding metric timeseries (identified by the view name as
metric name, and tag key/value pairs as dimensions).

* Review feedback (squash me)

* More review feedback (squash me)

* Use a configuration builder pattern (squash me)

* Fixes for checker framework compliance (squash me)

* Review feedback (squash me)

* Remove support for AggregationWindow.Interval (squash me)

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