Get rid of pkg_resources #788

Job	Run time
doc (docs)	1m 30s
check (build)	38s
doc (docs-gnocchi-web)	1m 31s
check (pep8)	37s
test (py39, postgresql-file-upgrade-from-4.4)	1m 22s
test (py39, mysql-file)	1m 38s
test (py39, mysql-file-sqlalchemy14)	1m 31s
test (py39, mysql-swift)	1m 31s
test (py39, mysql-s3)	1m 29s
test (py39, postgresql-file)	1m 31s
test (py39, postgresql-file-sqlalchemy14)	1m 29s
test (py39, postgresql-swift)	1s
test (py39, postgresql-s3)	1m 2s
test (py311, postgresql-file-upgrade-from-4.4)	1m 29s
test (py311, mysql-file)	1m 47s
test (py311, mysql-file-sqlalchemy14)	1m 47s
test (py311, mysql-swift)	1m 48s
test (py311, mysql-s3)	1m 46s
test (py311, postgresql-file)	1m 47s
test (py311, postgresql-file-sqlalchemy14)	1m 46s
test (py311, postgresql-swift)	1m 44s
test (py311, postgresql-s3)	1m 45s
	31m 29s

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