CI testing

Add support for `scatter_add` gradient #4

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Run time

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Job	Run time
pytester (ubuntu-22.04, 3.10, latest)	12m 3s
pytester (ubuntu-22.04, 3.10, nightly)	11m 19s
pytester (macOS-12, 3.10, latest)	11m 25s
pytester (macOS-12, 3.10, nightly)	12m 35s
pytester (windows-2022, 3.10, latest)	11m 31s
pytester (windows-2022, 3.10, nightly)	11m 2s
pytester (ubuntu-22.04, 3.11, latest)	12m 4s
testing-guardian	1s
	1h 22m 0s