Add CLI option to measure time breakdown in GEMM bench

[William Tambellini]

In
https://github.com/pytorch/FBGEMM/blob/main/bench/GEMMsBenchmark.cc
there is a define in order to measure and log the time breakdown.
Would you mind if I convert it to a runtime cli arg ?
eg
./GEMMsBenchmark --timebreakdown=1
default 0

[Benson Ma]

Hi @WilliamTambellini sure, please feel free to open a PR for us to review

[William Tambellini]

done in
#1725