Add on_schema_change possibility #308

Job	Run time
build packages	22s
unit test / python 3.8	51s
unit test / python 3.9	1m 8s
unit test / python 3.10	1m 18s
unit test / python 3.11	1m 8s
verify packages / python 3.8 / ubuntu-latest	43s
verify packages / python 3.9 / ubuntu-latest	47s
verify packages / python 3.10 / ubuntu-latest	51s
verify packages / python 3.11 / ubuntu-latest	48s
verify packages / python 3.8 / macos-latest	1m 16s
verify packages / python 3.9 / macos-latest	37s
verify packages / python 3.10 / macos-latest	34s
verify packages / python 3.11 / macos-latest	34s
verify packages / python 3.8 / windows-latest	1m 35s
verify packages / python 3.9 / windows-latest	1m 40s
verify packages / python 3.10 / windows-latest	1m 58s
verify packages / python 3.11 / windows-latest	1m 45s
	17m 55s

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