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Create a metaclass for Singleton's and remove pysingleton #385

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Run time

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Job	Run time
test (3.14, ubuntu-22.04)	4m 35s
test (3.14, windows-latest)	4m 59s
test (3.7, windows-latest)	3m 4s
lint	9s
test (3.7, ubuntu-22.04)	1m 40s
test (3.14, macos-latest)	2m 8s
	16m 35s