quantile: use `nth_element`, support Eigen vectors for multi-p inputs #5610

Job	Run time
mix fun and prob tests 1 (ubuntu-24.04-arm)	30m 57s
mix fun and prob tests 1 (windows-latest)	46m 51s
mix fun and prob tests 1 (windows-11-arm)	1h 4m 25s
mix fun and prob tests 4 (windows-latest)	35m 9s
mix fun and prob tests 3 (windows-11-arm)	37m 40s
mix fun and prob tests 2 (windows-11-arm)	41m 14s
mix fun and prob tests 3 (windows-latest)	30m 17s
mix fun and prob tests 5 (windows-latest)	4h 0m 0s
mix fun and prob tests 5 (windows-11-arm)	2h 4m 7s
mix fun and prob tests 5 (ubuntu-24.04-arm)	2h 18m 8s
mix fun and prob tests 2 (windows-latest)	55m 35s
mix fun and prob tests 2 (ubuntu-24.04-arm)	39m 31s
misc tests (windows-latest)	5m 49s
mix fun and prob tests 4 (windows-11-arm)	33m 5s
mix fun and prob tests 3 (ubuntu-24.04-arm)	33m 37s
fwd tests (windows-latest)	7m 29s
fwd tests (ubuntu-24.04-arm)	4m 16s
non-fun mix tests (windows-latest)	13m 31s
fwd tests (windows-11-arm)	9m 19s
rev tests (ubuntu-24.04-arm)	21m 25s
prim tests (windows-11-arm)	56m 40s
non-fun mix tests (ubuntu-24.04-arm)	5m 17s
prim tests (windows-latest)	1h 48m 45s
rev tests (windows-latest)	47m 23s
misc tests (windows-11-arm)	7m 52s
mix fun and prob tests 4 (ubuntu-24.04-arm)	26m 38s
prim tests (ubuntu-24.04-arm)	45m 20s
non-fun mix tests (windows-11-arm)	11m 33s
misc tests (ubuntu-24.04-arm)	3m 14s
rev tests (windows-11-arm)	27m 16s
	22h 32m 23s

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