Added capability of exporting per operation type full latency percentile output file

[filipecosta90]

The following PR enables exporting the full percentile latencies of each operation type, in the HdrHistogram standard output format, via the added properties histogram.percentiles.export (true or false) and histogram.percentiles.export.filepath (default = "./" which stores to current folder ).

Tools like https://hdrhistogram.github.io/HdrHistogram/plotFiles.html and https://github.com/BrunoBonacci/hdr-plot can be used to generate charts like the following one:

[dbsid]

cool! Thank you.