Add tests and CI #21

Job	Run time
build packages	21s
unit test / python 3.8	1m 11s
unit test / python 3.9	1m 6s
unit test / python 3.10	41s
unit test / python 3.11	41s
verify packages / python 3.8 / ubuntu-latest	36s
verify packages / python 3.9 / ubuntu-latest	35s
verify packages / python 3.10 / ubuntu-latest	49s
verify packages / python 3.11 / ubuntu-latest	47s
verify packages / python 3.8 / macos-latest	52s
verify packages / python 3.9 / macos-latest	55s
verify packages / python 3.10 / macos-latest	59s
verify packages / python 3.11 / macos-latest	1m 11s
verify packages / python 3.8 / windows-latest	2m 12s
verify packages / python 3.9 / windows-latest	3m 4s
verify packages / python 3.10 / windows-latest	1m 25s
verify packages / python 3.11 / windows-latest	1m 22s
	18m 47s

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