Get rid of pkg_resources #849

Job	Run time
doc (docs)	1m 32s
doc (docs-gnocchi-web)	1m 32s
check (build)	37s
test (py39, postgresql-file-upgrade-from-4.5)	2m 33s
check (pep8)	36s
test (py39, mysql-file)	2m 53s
test (py39, mysql-file-sqlalchemy14)	2m 50s
test (py39, mysql-swift)	3m 21s
test (py39, mysql-s3)	3m 45s
test (py39, postgresql-file)	2m 45s
test (py39, postgresql-file-sqlalchemy14)	2m 47s
test (py39, postgresql-swift)	3m 18s
test (py39, postgresql-s3)	3m 32s
test (py311, postgresql-file-upgrade-from-4.5)	2m 33s
test (py311, mysql-file)	3m 4s
test (py311, mysql-file-sqlalchemy14)	2m 39s
test (py311, mysql-swift)	3m 12s
test (py311, mysql-s3)	3m 39s
test (py311, postgresql-file)	2m 48s
test (py311, postgresql-file-sqlalchemy14)	2m 30s
test (py311, postgresql-swift)	3m 1s
test (py311, postgresql-s3)	3m 16s
	58m 43s

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