Benchmark package initial release

[hassila (Joakim Hassila)]

To follow up on the linear/power of two bucket scheme currently used, this is the foundation we'll use instead as mentioned:

Histogram (HDR Histogram native Swift port) package

We are happy to share Histogram with the community and hope it will be useful for many of you. Histogram is a port of Gil Tene's High Dynamic Range (HDR) Histogram to native Swift. It provides recording and analyzing of sampled data value counts across a large, configurable value range with configurable precision within the range. The resulting "HDR" histogram allows for fast and accurate analysis of the extreme ranges of data with non-normal distributions, like latency. Histogram supports the…