Experimenting with C++ threads to replace Intel TBB #5156

Job	Run time
rev tests (windows-11-arm)	25m 13s
misc tests (windows-latest)	5m 37s
fwd tests (windows-11-arm)	9m 27s
prim tests (windows-11-arm)	50m 8s
prim tests (ubuntu-24.04-arm)	42m 33s
misc tests (windows-11-arm)	7m 46s
misc tests (ubuntu-24.04-arm)	3m 23s
fwd tests (ubuntu-24.04-arm)	4m 11s
prim tests (windows-latest)	1h 39m 36s
non-fun mix tests (ubuntu-24.04-arm)	5m 22s
rev tests (windows-latest)	6h 0m 5s
fwd tests (windows-latest)	8m 34s
mix fun and prob tests 3 (windows-11-arm)	39m 21s
non-fun mix tests (windows-11-arm)	10m 41s
non-fun mix tests (windows-latest)	12m 6s
mix fun and prob tests 1 (windows-11-arm)	45m 55s
mix fun and prob tests 3 (ubuntu-24.04-arm)	28m 27s
rev tests (ubuntu-24.04-arm)	19m 41s
mix fun and prob tests 2 (windows-11-arm)	38m 37s
mix fun and prob tests 5 (ubuntu-24.04-arm)	2h 20m 41s
mix fun and prob tests 4 (windows-11-arm)	35m 49s
mix fun and prob tests 2 (ubuntu-24.04-arm)	38m 25s
mix fun and prob tests 5 (windows-11-arm)	2h 41m 29s
mix fun and prob tests 4 (windows-latest)	42m 44s
mix fun and prob tests 5 (windows-latest)	4h 4m 45s
mix fun and prob tests 1 (windows-latest)	46m 16s
mix fun and prob tests 1 (ubuntu-24.04-arm)	30m 0s
mix fun and prob tests 2 (windows-latest)	53m 44s
mix fun and prob tests 3 (windows-latest)	41m 31s
mix fun and prob tests 4 (ubuntu-24.04-arm)	26m 20s
	1d 3h 58m 27s

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