tests: benchmarks: thread_metric: Record measurements

Extentd 'benchmark.thread_metric' (tests/benchmarks/thread_metric)
test suite to collect benchmark measurements in Twister reports
as recordings parsed from the test's output: time period values
as well as errors.

Additionally, each test is executed until it makes at least 3
measurements to estimate variance.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>