Split store-gateway into index-gateway and chunks-gateway #63

Job	Run time
build	7m 58s
test	29m 14s
lint	3m 52s
integration-configs-db	3m 45s
integration (requires_docker)	10m 45s
integration (integration_alertmanager)	5m 24s
integration (integration_backward_compatibility)	18m 32s
integration (integration_memberlist)	6m 38s
integration (integration_querier)	27m 17s
integration (integration_ruler)	5m 51s
integration (integration_query_fuzz)	3m 28s
deploy_website	0s
deploy	0s
	2h 2m 44s

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