CI testing

Make `LitAPI.predict` optional and validate API implementation #1935

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Run time

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Job	Run time
pytester (ubuntu-latest, 3.9)	5m 36s
pytester (ubuntu-latest, 3.10)	4m 58s
pytester (ubuntu-latest, 3.11)	5m 34s
pytester (macos-latest, 3.12)	4m 55s
pytester (windows-latest, 3.11)	7m 20s
pytester (ubuntu-20.04, 3.9, oldest)	5m 6s
tests-guardian	1s
	33m 30s