Add users stats http api to ingester (#6178) #11

Job	Run time
build	4m 6s
lint	4m 13s
CodeQL	7m 17s
test	15m 29s
integration-configs-db	2m 20s
integration (requires_docker)	6m 23s
integration (integration_alertmanager)	4m 16s
integration (integration_backward_compatibility)	9m 17s
integration (integration_memberlist)	7m 20s
integration (integration_querier)	12m 20s
integration (integration_ruler)	4m 28s
integration (integration_query_fuzz)	2m 49s
deploy_website	0s
deploy	0s
	1h 20m 18s

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