Benchpark info command, new experiment and system directives #2751

Job	Run time
changes	2s
style / lint	12s
docs / build	1m 56s
license / verify-license	7s
run / dynamicdryrunexperiments	2m 34s
run / dryrunexperiments	2m 33s
run / saxpy	2m 45s
docs / deploy	0s
	10m 9s

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