* This change abstracts the DatadogStatsClient into a ForemStatsClient.
The purpose of this abstraction is to set the foundation for a subsequent PR that will allow one to use New Relic for recording Forem stats, instead of Datadog, if there is a New Relic configuration found.
This specific change creates an abstraction layer that can be built upon, without changing any actual default behavior. All specs still pass.
* Use delegate instead of explicit methods.
* Delegate instead of explicit methods.
* Fix the error.
* Refactor according to the suggestions in the comments.
* Ooops. Stats work better when all of the code is committed.
* Removing the alias of count to increment since that was done in error.
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