C/C++ CI

Create `.readthedocs.yaml` #1494

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Run time

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Job	Run time
test-tcc	27s
test (ubuntu-latest)	11s
bench	4s
check-arities	12s
check-fmt	5s
test (macos-latest)	16s
test-cxx-stmt	3s
test (windows-latest)	15s
	1m 33s