feat: add comment metadata api endpoint #1026

Job	Run time
mypy check on linux (3.8)	48s
linting-linux	5s
lint commit message	27s
mypy check on linux (3.9)	56s
mypy check on linux (3.10)	54s
mypy check on linux (3.11)	55s
mypy check on linux (3.12)	1m 5s
pytest on linux (3.8)	1m 34s
pytest on linux (3.9)	1m 35s
pytest on linux (3.10)	1m 52s
pytest on linux (3.11)	1m 33s
conda package build (and upload if release)	0s
build python package	0s
merge current tag to main branch	0s
test coverage	0s
publish python package	0s
	11m 44s

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