fix: add basic codecov.yml (#1812) #10879

Job	Run time
Typos Check	7s
Coverage (ubuntu-latest, nightly)	16m 13s
determine-runner	3s
markdown_lint	4s
Unit tests on ubuntu-latest	22m 0s
Lints and doc tests on ubuntu-latest	9m 58s
Unit tests on windows-latest	33m 58s
Lints and doc tests on windows-latest	20m 22s
Unit tests on macos-latest	29m 8s
Lints and doc tests on macos-latest	9m 31s
Memory leak checks	2m 30s
CI status checks	1s
	2h 23m 55s

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