perf: initial version of 1M operations test

The test can be used for regression testing. It is advisable to tune
the machine: check the NUMA configuration, fix the pstate or similar
CPU autotune. Although, running dozen times gives more-less stable
result for the peak performance, that should be enough for regression
identification.

NO_DOC=adding an internal test
NO_CHANGELOG=ditto
NO_TEST=ditto