Imports of singleton_counter command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/performancecopilot/speed/v4Package speed implements a golang client for the Performance Co-Pilot instrumentation API.
logPackage log implements a simple logging package.
timePackage time provides functionality for measuring and displaying time.