Add support for Python's "Limited API"; Test cibuildwheel and py >=3.5 using `TestPythonSML.py` #439

Job	Run time
build-*nix (ubuntu-latest)	5m 17s
wheel-*nix (ubuntu-latest)	5m 54s
build-*nix (macos-12)	9m 9s
wheel-*nix (macos-12)	3m 32s
build-windows	7m 41s
build-*nix (macos-latest)	5m 4s
wheel-*nix (macos-latest)	2m 0s
wheel-*nix (windows-latest)	6m 55s
Test wheel on all python versions (ubuntu-20.04, 5)	9s
Test wheel on all python versions (ubuntu-20.04, 6)	13s
Test wheel on all python versions (ubuntu-20.04, 7)	3s
Test wheel on all python versions (ubuntu-20.04, 8)	5s
Test wheel on all python versions (ubuntu-20.04, 9)	5s
Test wheel on all python versions (ubuntu-20.04, 10)	7s
Test wheel on all python versions (ubuntu-20.04, 11)	5s
Test wheel on all python versions (ubuntu-20.04, 12)	6s
Test wheel on all python versions (macos-12, 5)	20s
Test wheel on all python versions (macos-12, 6)	23s
Test wheel on all python versions (macos-12, 7)	7s
Test wheel on all python versions (macos-12, 8)	8s
Test wheel on all python versions (macos-12, 9)	10s
Test wheel on all python versions (macos-12, 10)	7s
Test wheel on all python versions (macos-12, 11)	8s
Test wheel on all python versions (macos-12, 12)	9s
Test wheel on all python versions (macos-latest, 8)	32s
Test wheel on all python versions (macos-latest, 9)	6s
Test wheel on all python versions (macos-latest, 10)	7s
Test wheel on all python versions (macos-latest, 11)	7s
Test wheel on all python versions (macos-latest, 12)	8s
Publish to pypi.org	0s
Publish to test.pypi.org	0s
	48m 57s

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