Optimize Gnocchi aggregates API #514

Job	Run time
doc (docs)	5m 16s
doc (docs-gnocchi-web)	6m 44s
check (build)	4m 13s
check (pep8)	3m 57s
test (py38, mysql-ceph-upgrade-from-4.4)	5m 56s
test (py38, postgresql-file-upgrade-from-4.4)	6m 3s
test (py38, mysql-file)	8m 34s
test (py38, mysql-swift)	6m 49s
test (py38, mysql-s3)	8m 0s
test (py38, mysql-ceph)	18m 3s
test (py38, postgresql-file)	6m 54s
test (py38, postgresql-swift)	8m 32s
test (py38, postgresql-s3)	9m 42s
test (py38, postgresql-ceph)	19m 39s
test (py39, postgresql-file-upgrade-from-4.4)	5m 48s
test (py39, mysql-file)	6m 28s
test (py39, mysql-swift)	8m 15s
test (py39, mysql-s3)	10m 42s
test (py39, postgresql-file)	8m 2s
test (py39, postgresql-swift)	6m 48s
test (py39, postgresql-s3)	9m 5s
test (py311, postgresql-file-upgrade-from-4.4)	7m 19s
test (py311, mysql-file)	6m 13s
test (py311, mysql-swift)	8m 39s
test (py311, mysql-s3)	8m 18s
test (py311, postgresql-file)	6m 53s
test (py311, postgresql-swift)	6m 43s
test (py311, postgresql-s3)	9m 33s
	3h 47m 8s

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