FFM-2514 add function to convert various types to string #76
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What
Tightens up string conversion around attribute values when we're posting metrics.
Why
Previously if you provided an int value for an attribute then it was being sent to the metrics service as an empty string
Testing
Made my golang-server-sample use this branch of the SDK and I could see that integer attributes values were now being received by the metrics service on my local ff-server