benchmark

[FR] Add API to provide custom profilers #1807 (#1809)

This API is akin to the MemoryManager API and lets tools provide
their own profiler which is wrapped in the same way MemoryManager is
wrapped. Namely, the profiler provides Start/Stop methods that are called
at the start/end of running the benchmark in a separate pass.

Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>