If available, use CMake file API to discover targets #66

Job	Run time
pytest / setup	4s
pytest / pytest (macos-latest, 3.8)	1m 16s
pytest / pytest (macos-latest, 3.9)	48s
pytest / pytest (macos-latest, 3.10)	1m 5s
pytest / pytest (macos-latest, 3.11)	44s
pytest / pytest (macos-latest, 3.12)	47s
pytest / pytest (ubuntu-22.04, 3.8)	1m 41s
pytest / pytest (ubuntu-22.04, 3.9)	1m 21s
pytest / pytest (ubuntu-22.04, 3.10)	8m 15s
pytest / pytest (ubuntu-22.04, 3.11)	7m 57s
pytest / pytest (ubuntu-22.04, 3.12)	1m 20s
pytest / pytest (windows-latest, 3.8)	1m 58s
pytest / pytest (windows-latest, 3.9)	1m 48s
pytest / pytest (windows-latest, 3.10)	2m 5s
pytest / pytest (windows-latest, 3.11)	2m 0s
pytest / pytest (windows-latest, 3.12)	1m 58s
pytest / pytest (ubuntu-20.04, 3.6)	47s
	35m 54s

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