Optimize Gnocchi aggregates API #568

Job	Run time
check (build)	3m 38s
check (pep8)	4m 28s
doc (docs)	30m 15s
doc (docs-gnocchi-web)	30m 15s
test (py38, mysql-ceph-upgrade-from-4.4)	4m 41s
test (py38, postgresql-file-upgrade-from-4.4)	58s
test (py38, mysql-file)	4m 27s
test (py38, mysql-swift)	4m 24s
test (py38, mysql-s3)	4m 40s
test (py38, mysql-ceph)	4m 43s
test (py38, postgresql-file)	4m 37s
test (py38, postgresql-swift)	1s
test (py38, postgresql-s3)	6s
test (py38, postgresql-ceph)	4m 38s
test (py39, postgresql-file-upgrade-from-4.4)	1s
test (py39, mysql-file)	1s
test (py39, mysql-swift)	1s
test (py39, mysql-s3)	1s
test (py39, postgresql-file)	1s
test (py39, postgresql-swift)	1s
test (py39, postgresql-s3)	1s
test (py311, postgresql-file-upgrade-from-4.4)	4m 33s
test (py311, mysql-file)	4m 36s
test (py311, mysql-swift)	4m 52s
test (py311, mysql-s3)	4m 55s
test (py311, postgresql-file)	4m 45s
test (py311, postgresql-swift)	4m 41s
test (py311, postgresql-s3)	4m 32s
	2h 14m 52s

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