[COD-2349] feat(callgrind): track subprocesses across fork and exec#25

GuillaumeLagrange wants to merge 2 commits into

cod-3196-fix-valgrind-separate-threadsyes-behavior-to-represent-osCodSpeedHQ/valgrind-codspeed:cod-3196-fix-valgrind-separate-threadsyes-behavior-to-represent-osfrom

cod-2349-support-subprocesses-in-valgrindCodSpeedHQ/valgrind-codspeed:cod-2349-support-subprocesses-in-valgrindCopy head branch name to clipboard