Move `arbitrary_with_max_volume()` from `GridAab` to `Vol`. #310

Job	Run time
no_std	25s
miri	1m 41s
build (ubuntu, stable, locked, true)	14m 4s
build (windows, stable, locked, false)	26m 12s
build (macos, stable, locked, false)	57m 10s
build (ubuntu, nightly, locked, false)	20m 20s
build (ubuntu, beta, locked, false)	12m 25s
build (ubuntu, stable, latest, false)	16m 1s
build (ubuntu, stable, minimal, false)	14m 0s
deploy	5s
fuzz	15m 26s
features	23m 53s
	3h 21m 42s

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