Replace inmemory index cache to fastcache based implementation #7928

Job	Run time
test	29m 47s
test	29m 55s
build	5m 52s
build	5m 52s
lint	23m 56s
lint	23m 56s
integration-configs-db	2m 57s
integration-configs-db	2m 57s
integration (requires_docker)	6m 27s
integration (requires_docker)	6m 27s
integration (integration_alertmanager)	5m 4s
integration (integration_alertmanager)	5m 4s
integration (integration_backward_compatibility)	11m 27s
integration (integration_backward_compatibility)	11m 27s
integration (integration_memberlist)	8m 18s
integration (integration_memberlist)	8m 18s
integration (integration_querier)	16m 14s
integration (integration_querier)	16m 14s
integration (integration_ruler)	4m 44s
integration (integration_ruler)	4m 44s
integration (integration_query_fuzz)	3m 3s
integration (integration_query_fuzz)	3m 3s
deploy_website	0s
deploy_website	0s
deploy	0s
deploy	0s
	3h 55m 46s

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