(PUP-2758) Add micro benchmark(s) task

This adds a benchmark that runs a series of puppet manifests that
are measured individually for parse and evaluation time. Each
manifest is measured 100x each for parse and evaluation. The benchmark
total time includes running all of them (including overhead of
measuring the details). Details are output as average of all runs
per detail where parsing and evaluating is output as separate entries.

The sample file written is for the total average.