update metrics library after review

* Fix PointMap comparison bug and style.
* Rename ReAllocBunch to StableStore, and GC its unused lookup method.
  Rename method apply -> for_each
* Rename CounterIncrement -> Counter::Increment
  and GaugeMeasurement -> Gauge::Measurement
* Rename PointMapBacking -> PointMap::BackingMap
* Make single-argument constructors explicit.
* Do not use actual time in dummy.
* Rename mergeWithMap -> mergeFromSamples, and do some refactoring of it.
* Refactor opaque handle implementation into its own class
* Copy strings into snapshot, do not refer to strings owned elsewhere.
* Refactor _pointMaps code into new PointMapCollection class
* Split aggregators into their own files, move Bucket into its own files,
  and rename files for CurrentSamples.
* Make Counter and Gauge only hold the MetricName and supply an
  empty Point via default argument instead.
* Split out StableStore test, and test for pointer equality.
* Separate out ticker thread, and arrange for fast stop.
* Use less swap.
* Add totalSnapshot() facility.

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