Add memberships statistic (#344) #4603

Job	Run time
wagon_tests / rubocop	2m 23s
wagon_tests / pending_specs	3m 29s
wagon_tests / specs	6m 22s
wagon_tests / feature specs	5m 27s
wagon_tests / seeds	-1s
wagon_tests / notify_statuscope	-1s
	17m 39s

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