[Feature] Preproc for datasets #966

Job	Run time
unittests-smacv2	0s
unittests-pettingzoo / linux-job	8m 48s
unittests-atari-dqn (3.9, 12.1) / linux-job	13m 14s
unittests-brax (3.9, 12.1) / linux-job	8m 32s
unittests-d4rl (3.9, 12.1) / linux-job	9m 9s
unittests-envpool (3.9, 12.1) / linux-job	9m 19s
unittests-gendgrl (3.9, 12.1) / linux-job	6m 25s
unittests-gym (3.9, 12.1) / linux-job	19m 20s
unittests-jumanji (3.9, 12.1) / linux-job	8m 31s
unittests-minari (3.9, 12.1) / linux-job	15m 24s
unittests-openx (3.9, 12.1) / linux-job	7m 21s
unittests-robohive (3.9, 12.1) / linux-job	8m 57s
unittests-roboset (3.9, 12.1) / linux-job	7m 21s
unittests-vd4rl (3.9, 12.1) / linux-job	8m 7s
unittests-sklearn (3.9, 12.1) / linux-job	5m 34s
unittests-vmas (3.9, 12.1) / linux-job	11m 32s
	2h 27m 34s

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