Add memberships statistic (#344) #4605

Job	Run time
wagon_tests / rubocop	2m 42s
wagon_tests / feature specs	5m 56s
wagon_tests / specs	6m 34s
wagon_tests / pending_specs	2m 58s
wagon_tests / seeds	-9s
wagon_tests / notify_statuscope	-1s
	18m 0s

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