Split store-gateway into index-gateway and chunks-gateway #65

Job	Run time
lint	5m 17s
build	7m 39s
test	1h 2m 46s
integration-configs-db	3m 35s
integration (requires_docker)	9m 24s
integration (integration_alertmanager)	5m 53s
integration (integration_backward_compatibility)	11m 31s
integration (integration_memberlist)	7m 0s
integration (integration_querier)	19m 15s
integration (integration_ruler)	5m 36s
integration (integration_query_fuzz)	3m 47s
deploy_website	0s
deploy	0s
	2h 21m 43s

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