ci: add c++ coverage #195

Job	Run time
check-manifest	33s
test (3.8, ubuntu-latest)	1m 51s
Lint	30s
test (3.8, macos-latest)	2m 41s
test (3.8, windows-latest)	5m 10s
test (3.9, ubuntu-latest)	1m 46s
test (3.9, macos-latest)	3m 15s
test (3.9, windows-latest)	6m 17s
test (3.10, ubuntu-latest)	1m 13s
test (3.10, macos-latest)	2m 45s
test (3.10, windows-latest)	7m 22s
test (3.11, ubuntu-latest)	2m 2s
test (3.11, macos-latest)	3m 54s
test (3.11, windows-latest)	3m 47s
Build sdist, Publish to PyPI on tagged versions	0s
	43m 6s

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