chore: improve 'export_values' endpoint and cli sub-command interface #975

Job	Run time
linting-linux	6s
lint commit message	29s
mypy check on linux (3.8)	45s
mypy check on linux (3.9)	53s
pytest on linux (3.8)	1m 28s
mypy check on linux (3.10)	50s
pytest on linux (3.9)	1m 26s
mypy check on linux (3.11)	52s
pytest on linux (3.10)	1m 28s
mypy check on linux (3.12)	1m 5s
pytest on linux (3.11)	1m 15s
conda package build (and upload if release)	4m 46s
merge current tag to main branch	0s
test coverage	4s
build python package	46s
publish python package	20s
	16m 33s

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